Browse upcoming holidays, observances, awareness dates, and notable events with their next occurrence and regional relevance. Select any event to see when it next takes place, including regional variations where available.
| Event | Next occurrence Sorted ascending | Regions |
|---|---|---|
| Black History Month | 1 October 2026 to 31 October 2026 | United Kingdom |
| 1 February 2027 to 28 February 2027 | United States | |
| World Space Week | 4 October 2026 to 10 October 2026 | Worldwide |
| World Cotton Day | Wednesday, 7 October 2026 | Worldwide |
| Uganda Independence Day | Friday, 9 October 2026 | Uganda |
| World Post Day | Friday, 9 October 2026 | Worldwide |
| Fiji Independence Day | Saturday, 10 October 2026 | Fiji |
| World Mental Health Day | Saturday, 10 October 2026 | Worldwide |
| World Migratory Bird Day | Saturday, 10 October 2026 | Worldwide |
| International Day of the Girl Child | Sunday, 11 October 2026 | Worldwide |
| National Coming Out Day | Sunday, 11 October 2026 | Worldwide |
| Columbus Day | Monday, 12 October 2026 | United States |
| Equatorial Guinea Independence Day | Monday, 12 October 2026 | Equatorial Guinea |
| Spain National Day | Monday, 12 October 2026 | Spain |
| World Arthritis Day | Monday, 12 October 2026 | Worldwide |
| International Day for Disaster Risk Reduction | Tuesday, 13 October 2026 | Worldwide |
| Ada Lovelace Day | Tuesday, 13 October 2026 | Worldwide |
| World Standards Day | Wednesday, 14 October 2026 | Worldwide |
| International Day of Rural Women | Thursday, 15 October 2026 | Worldwide |
| World Food Day | Friday, 16 October 2026 | Worldwide |
| International Day for the Eradication of Poverty | Saturday, 17 October 2026 | Worldwide |
| International Day of the Intangible Cultural Heritage | Saturday, 17 October 2026 | Worldwide |
| Sweetest Day | Saturday, 17 October 2026 | United States |
| World Osteoporosis Day | Tuesday, 20 October 2026 | Worldwide |
| Back to the Future Day | Wednesday, 21 October 2026 | Worldwide |
| Hungary National Day | Friday, 23 October 2026 | Hungary |
| International Day of the Snow Leopard | Friday, 23 October 2026 | Worldwide |
| Mole Day | Friday, 23 October 2026 | Worldwide |
| United Nations Day | Saturday, 24 October 2026 | Worldwide |
| World Development Information Day | Saturday, 24 October 2026 | Worldwide |
| Zambia Independence Day | Saturday, 24 October 2026 | Zambia |
| Disarmament Week | 24 October 2026 to 30 October 2026 | Worldwide |
| Global Media and Information Literacy Week | 24 October 2026 to 31 October 2026 | Worldwide |
| Daylight Saving Time Ends | Sunday, 25 October 2026 | Europe , United Kingdom |
| Sunday, 1 November 2026 | United States | |
| Kazakhstan Republic Day | Sunday, 25 October 2026 | Kazakhstan |
| World Pasta Day | Sunday, 25 October 2026 | Worldwide |
| Austria National Day | Monday, 26 October 2026 | Austria |
| Black Cat Day | Tuesday, 27 October 2026 | United Kingdom |
| Saint Vincent and the Grenadines Independence Day | Tuesday, 27 October 2026 | Saint Vincent and the Grenadines |
| Turkmenistan Independence Day | Tuesday, 27 October 2026 | Turkmenistan |
| World Day for Audiovisual Heritage | Tuesday, 27 October 2026 | Worldwide |
| Independent Czechoslovak State Day | Wednesday, 28 October 2026 | Czechia |
| Ohi Day | Wednesday, 28 October 2026 | Greece |
| International Day of Care and Support | Thursday, 29 October 2026 | Worldwide |
| International Internet Day | Thursday, 29 October 2026 | Worldwide |
| Türkiye Republic Day | Thursday, 29 October 2026 | Türkiye |
| World Stroke Day | Thursday, 29 October 2026 | Worldwide |
| Mischief Night | Friday, 30 October 2026 | Worldwide |
| Halloween | Saturday, 31 October 2026 | Worldwide |
| World Cities Day | Saturday, 31 October 2026 | Worldwide |
| Algeria Revolution Day | Sunday, 1 November 2026 | Algeria |
| Antigua and Barbuda Independence Day | Sunday, 1 November 2026 | Antigua and Barbuda |
| World Vegan Day | Sunday, 1 November 2026 | Worldwide |
| Día de los Muertos | 1 November 2026 to 2 November 2026 | Mexico |
| World Vegan Month | 1 November 2026 to 30 November 2026 | Worldwide |
| International Day to End Impunity for Crimes against Journalists | Monday, 2 November 2026 | Worldwide |
| Dominica Independence Day | Tuesday, 3 November 2026 | Dominica |
| Federated States of Micronesia Independence Day | Tuesday, 3 November 2026 | Federated States of Micronesia |
| International Day for Biosphere Reserves | Tuesday, 3 November 2026 | Worldwide |
| Panama Separation Day | Tuesday, 3 November 2026 | Panama |
| Sandwich Day | Tuesday, 3 November 2026 | Worldwide |
| Tonga Constitution Day | Wednesday, 4 November 2026 | Tonga |
| Guy Fawkes Night | Thursday, 5 November 2026 | United Kingdom |
| International Day against Violence and Bullying at School, including Cyberbullying | Thursday, 5 November 2026 | Worldwide |
| World Tsunami Awareness Day | Thursday, 5 November 2026 | Worldwide |
| International Day for Preventing the Exploitation of the Environment in War and Armed Conflict | Friday, 6 November 2026 | Worldwide |
| Remembrance Sunday | Sunday, 8 November 2026 | United Kingdom |
| Cambodia Independence Day | Monday, 9 November 2026 | Cambodia |
| International Week of Science and Peace | 9 November 2026 to 15 November 2026 | Worldwide |
| World Science Day for Peace and Development | Tuesday, 10 November 2026 | Worldwide |
| Veterans Day | Wednesday, 11 November 2026 | United States |
| Angola Independence Day | Wednesday, 11 November 2026 | Angola |
| Poland Independence Day | Wednesday, 11 November 2026 | Poland |
| Singles' Day | Wednesday, 11 November 2026 | Worldwide |
| Remembrance Day | Wednesday, 11 November 2026 | Canada |
| Remembrance Day | Wednesday, 11 November 2026 | Australia |
| World Pneumonia Day | Thursday, 12 November 2026 | Worldwide |
| World Kindness Day | Friday, 13 November 2026 | Worldwide |
| Transgender Awareness Week | 13 November 2026 to 19 November 2026 | Worldwide |
| World Diabetes Day | Saturday, 14 November 2026 | Worldwide |
| International Day against Illicit Trafficking in Cultural Property | Saturday, 14 November 2026 | Worldwide |
| International Day for the Prevention of and Fight against All Forms of Transnational Organized Crime | Sunday, 15 November 2026 | Worldwide |
| State of Palestine Independence Day | Sunday, 15 November 2026 | State of Palestine |
| World Prematurity Day | Sunday, 15 November 2026 | Worldwide |
| World Day of Remembrance for Road Traffic Victims | Sunday, 15 November 2026 | Worldwide |
| International Day of the Mediterranean Diet | Monday, 16 November 2026 | Worldwide |
| International Day for Tolerance | Monday, 16 November 2026 | Worldwide |
| World Cervical Cancer Elimination Day | Tuesday, 17 November 2026 | Worldwide |
| International Day of Islamic Art | Wednesday, 18 November 2026 | Worldwide |
| Latvia Independence Day | Wednesday, 18 November 2026 | Latvia |
| World COPD Day | Wednesday, 18 November 2026 | Worldwide |
| World Day for the Prevention of and Healing from Child Sexual Exploitation, Abuse and Violence | Wednesday, 18 November 2026 | Worldwide |
| World AMR Awareness Week | 18 November 2026 to 24 November 2026 | Worldwide |
| International Men's Day | Thursday, 19 November 2026 | Worldwide |
| Monaco National Day | Thursday, 19 November 2026 | Monaco |
| World Pancreatic Cancer Day | Thursday, 19 November 2026 | Worldwide |
| World Philosophy Day | Thursday, 19 November 2026 | Worldwide |
| World Toilet Day | Thursday, 19 November 2026 | Worldwide |
| World Children's Day | Friday, 20 November 2026 | Worldwide |
| Africa Industrialization Day | Friday, 20 November 2026 | Worldwide |
| Transgender Day of Remembrance | Friday, 20 November 2026 | Worldwide |
| Oman National Day | 20 November 2026 to 21 November 2026 | Oman |
| World Television Day | Saturday, 21 November 2026 | Worldwide |
| World Hello Day | Saturday, 21 November 2026 | Worldwide |
| Lebanon Independence Day | Sunday, 22 November 2026 | Lebanon |
| Fibonacci Day | Monday, 23 November 2026 | Worldwide |
| Game Day | Monday, 23 November 2026 | Japan |
| World Conjoined Twins Day | Tuesday, 24 November 2026 | Worldwide |
| Bosnia and Herzegovina Statehood Day | Wednesday, 25 November 2026 | Bosnia and Herzegovina |
| International Day for the Elimination of Violence against Women | Wednesday, 25 November 2026 | Worldwide |
| Suriname Independence Day | Wednesday, 25 November 2026 | Suriname |
| Thanksgiving Day | Thursday, 26 November 2026 | United States |
| World Sustainable Transport Day | Thursday, 26 November 2026 | Worldwide |
| Black Friday | Friday, 27 November 2026 | United States |
| International Day for the Elimination of Child, Early and Forced Marriage | Friday, 27 November 2026 | Worldwide |
| International Day of Engagement in Science for Sustainable Development | Friday, 27 November 2026 | Worldwide |
| Albania Independence Day | Saturday, 28 November 2026 | Albania |
| Mauritania Independence Day | Saturday, 28 November 2026 | Mauritania |
| Timor-Leste Proclamation of Independence Day | Saturday, 28 November 2026 | Timor-Leste |
| Holodomor Remembrance Day | Saturday, 28 November 2026 | Ukraine |
| International Day of Solidarity with the Palestinian People | Sunday, 29 November 2026 | Worldwide |
| Cyber Monday | Monday, 30 November 2026 | United States |
| Barbados Independence Day | Monday, 30 November 2026 | Barbados |
| Day of Remembrance for all Victims of Chemical Warfare | Monday, 30 November 2026 | Worldwide |
| Computer Security Day | Monday, 30 November 2026 | Worldwide |
| Giving Tuesday | Tuesday, 1 December 2026 | United States |
| World AIDS Day | Tuesday, 1 December 2026 | Worldwide |
| Central African Republic National Day | Tuesday, 1 December 2026 | Central African Republic |
| Romania National Day | Tuesday, 1 December 2026 | Romania |
| Eid Al Etihad | Wednesday, 2 December 2026 | United Arab Emirates |
| International Day for the Abolition of Slavery | Wednesday, 2 December 2026 | Worldwide |
| Laos National Day | Wednesday, 2 December 2026 | Laos |
| World Futures Day | Wednesday, 2 December 2026 | Worldwide |
| International Day of Persons with Disabilities | Thursday, 3 December 2026 | Worldwide |
| International Day against Unilateral Coercive Measures | Friday, 4 December 2026 | Worldwide |
| International Day of Banks | Friday, 4 December 2026 | Worldwide |
| International Volunteer Day for Economic and Social Development | Saturday, 5 December 2026 | Worldwide |
| Thailand National Day | Saturday, 5 December 2026 | Thailand |
| World Soil Day | Saturday, 5 December 2026 | Worldwide |
| Day of the Ninja | Saturday, 5 December 2026 | Worldwide |
| Hanukkah | 5 December 2026 to 12 December 2026 | Worldwide |
| Finland Independence Day | Sunday, 6 December 2026 | Finland |
| Saint Nicholas Day | Sunday, 6 December 2026 | Worldwide |
| National Day of Remembrance and Action on Violence Against Women | Sunday, 6 December 2026 | Canada |
| International Civil Aviation Day | Monday, 7 December 2026 | Worldwide |
| Pretend to Be a Time Traveler Day | Tuesday, 8 December 2026 | Worldwide |
| International Anti-Corruption Day | Wednesday, 9 December 2026 | Worldwide |
| International Day of Commemoration and Dignity of the Victims of the Crime of Genocide and of the Prevention of this Crime | Wednesday, 9 December 2026 | Worldwide |
| Tanzania Independence Day | Wednesday, 9 December 2026 | Tanzania |
| Christmas Jumper Day | Thursday, 10 December 2026 | United Kingdom |
| Human Rights Day | Thursday, 10 December 2026 | Worldwide |
| Burkina Faso National Day | Friday, 11 December 2026 | Burkina Faso |
| International Mountain Day | Friday, 11 December 2026 | Worldwide |
| International Day of Neutrality | Saturday, 12 December 2026 | Worldwide |
| International Universal Health Coverage Day | Saturday, 12 December 2026 | Worldwide |
| Jamhuri Day | Saturday, 12 December 2026 | Kenya |
| Monkey Day | Monday, 14 December 2026 | Worldwide |
| International Day against Colonialism in All its Forms and Manifestations | Monday, 14 December 2026 | Worldwide |
| World Turkic Language Family Day | Tuesday, 15 December 2026 | Worldwide |
| Bahrain National Day | Wednesday, 16 December 2026 | Bahrain |
| Kazakhstan Independence Day | Wednesday, 16 December 2026 | Kazakhstan |
| Las Posadas | 16 December 2026 to 24 December 2026 | Mexico |
| Bhutan National Day | Thursday, 17 December 2026 | Bhutan |
| International Migrants Day | Friday, 18 December 2026 | Worldwide |
| Niger Republic Day | Friday, 18 December 2026 | Niger |
| Qatar National Day | Friday, 18 December 2026 | Qatar |
| World Arabic Language Day | Friday, 18 December 2026 | Worldwide |
| Ugly Christmas Sweater Day | Friday, 18 December 2026 | Worldwide |
| International Day of Recognition for Women Searchers of Missing Persons | Saturday, 19 December 2026 | Worldwide |
| International Human Solidarity Day | Sunday, 20 December 2026 | Worldwide |
| Winter Solstice | Monday, 21 December 2026 | Worldwide |
| World Basketball Day | Monday, 21 December 2026 | Worldwide |
| World Meditation Day | Monday, 21 December 2026 | Worldwide |
| Festivus | Wednesday, 23 December 2026 | Worldwide |
| Christmas Eve | Thursday, 24 December 2026 | Worldwide |
| International Anti-Cybercrime Day | Thursday, 24 December 2026 | Worldwide |
| Libya Independence Day | Thursday, 24 December 2026 | Libya |
| Christmas Day | Friday, 25 December 2026 | Worldwide |
| Boxing Day | Saturday, 26 December 2026 | United Kingdom |
| Kwanzaa | 26 December 2026 to 1 January 2027 | Worldwide |
| Christmas Sunday | Sunday, 27 December 2026 | Worldwide |
| International Day of Epidemic Preparedness | Sunday, 27 December 2026 | Worldwide |
| Boxing Day (substitute holiday) | Monday, 28 December 2026 | United Kingdom |
| New Year's Eve | Thursday, 31 December 2026 | Worldwide |
| New Year's Day | Friday, 1 January 2027 | Worldwide |
| New Year's Day Bank Holiday | Friday, 1 January 2027 | United Kingdom |
| Cuba Liberation Day | Friday, 1 January 2027 | Cuba |
| Haiti Independence Day | Friday, 1 January 2027 | Haiti |
| Sudan Independence Day | Friday, 1 January 2027 | Sudan |
| Veganuary | 1 January 2027 to 31 January 2027 | Worldwide |
| World Introvert Day | Saturday, 2 January 2027 | Worldwide |
| 2 January Holiday (Scotland) | Monday, 4 January 2027 | United Kingdom |
| Myanmar Independence Day | Monday, 4 January 2027 | Myanmar |
| World Braille Day | Monday, 4 January 2027 | Worldwide |
| National Day of Remembrance for Victims of Air Disasters | Friday, 8 January 2027 | Canada |
| World Logic Day | Thursday, 14 January 2027 | Worldwide |
| Blue Monday | Monday, 18 January 2027 | Worldwide |
| Martin Luther King Jr. Day | Monday, 18 January 2027 | United States |
| National Popcorn Day | Tuesday, 19 January 2027 | United States |
| National Hugging Day | Thursday, 21 January 2027 | Worldwide |
| International Day of Education | Sunday, 24 January 2027 | Worldwide |
| World Day for African and Afrodescendant Culture | Sunday, 24 January 2027 | Worldwide |
| Burns Night | Monday, 25 January 2027 | United Kingdom |
| International Day of Women in Multilateralism | Monday, 25 January 2027 | Worldwide |
| Australia Day | Tuesday, 26 January 2027 | Australia |
| International Customs Day | Tuesday, 26 January 2027 | Worldwide |
| International Day of Clean Energy | Tuesday, 26 January 2027 | Worldwide |
| International Day of Commemoration in Memory of the Victims of the Holocaust | Wednesday, 27 January 2027 | Worldwide |
| Data Protection Day | Thursday, 28 January 2027 | Worldwide |
| International Day of Peaceful Coexistence | Thursday, 28 January 2027 | Worldwide |
| National Puzzle Day | Friday, 29 January 2027 | United States |
| National Day of Remembrance of the Québec City Mosque Attack and Action against Islamophobia | Friday, 29 January 2027 | Canada |
| National Gorilla Suit Day | Sunday, 31 January 2027 | United States |
| Nauru Independence Day | Sunday, 31 January 2027 | Nauru |
| World Interfaith Harmony Week | 1 February 2027 to 7 February 2027 | Worldwide |
| LGBT+ History Month | 1 February 2027 to 28 February 2027 | United Kingdom |
| World Wetlands Day | Tuesday, 2 February 2027 | Worldwide |
| Groundhog Day | Tuesday, 2 February 2027 | Canada , United States |
| World Cancer Day | Thursday, 4 February 2027 | Worldwide |
| International Day of Human Fraternity | Thursday, 4 February 2027 | Worldwide |
| Sri Lanka National Independence Day | Thursday, 4 February 2027 | Sri Lanka |
| World Nutella Day | Friday, 5 February 2027 | Worldwide |
| International Day of Zero Tolerance for Female Genital Mutilation | Saturday, 6 February 2027 | Worldwide |
| Waitangi Day | Saturday, 6 February 2027 | New Zealand |
| Chinese New Year | Sunday, 7 February 2027 | Worldwide |
| Grenada Independence Day | Sunday, 7 February 2027 | Grenada |
| National Pizza Day | Tuesday, 9 February 2027 | United States |
| Shrove Tuesday | Tuesday, 9 February 2027 | Worldwide |
| Safer Internet Day | Tuesday, 9 February 2027 | Worldwide |
| Ash Wednesday | Wednesday, 10 February 2027 | Europe |
| International Day of the Arabian Leopard | Wednesday, 10 February 2027 | Worldwide |
| World Pulses Day | Wednesday, 10 February 2027 | Worldwide |
| Lent | 10 February 2027 to 25 March 2027 | Worldwide |
| International Day of Women and Girls in Science | Thursday, 11 February 2027 | Worldwide |
| Victory of the Islamic Revolution in Iran | Thursday, 11 February 2027 | Iran |
| International Day for the Prevention of Violent Extremism as and when Conducive to Terrorism | Friday, 12 February 2027 | Worldwide |
| Black Love Day | Saturday, 13 February 2027 | Worldwide |
| World Radio Day | Saturday, 13 February 2027 | Worldwide |
| Galentine's Day | Saturday, 13 February 2027 | Worldwide |
| Super Bowl Sunday | Sunday, 14 February 2027 | United States |
| Valentine's Day | Sunday, 14 February 2027 | Worldwide |
| Presidents' Day | Monday, 15 February 2027 | United States |
| Singles Awareness Day | Monday, 15 February 2027 | Worldwide |
| International Childhood Cancer Day | Monday, 15 February 2027 | Worldwide |
| Serbia Statehood Day | 15 February 2027 to 16 February 2027 | Serbia |
| Day of Restoration of the State of Lithuania | Tuesday, 16 February 2027 | Lithuania |
| Random Acts of Kindness Day | Wednesday, 17 February 2027 | Worldwide |
| Global Tourism Resilience Day | Wednesday, 17 February 2027 | Worldwide |
| Kosovo Independence Day | Wednesday, 17 February 2027 | Kosovo |
| Libya Revolution Day | Wednesday, 17 February 2027 | Libya |
| The Gambia Independence Day | Thursday, 18 February 2027 | The Gambia |
| National Pipe Smoking Day | Saturday, 20 February 2027 | United States |
| World Day of Social Justice | Saturday, 20 February 2027 | Worldwide |
| International Mother Language Day | Sunday, 21 February 2027 | Worldwide |
| Saint Lucia Independence Day | Monday, 22 February 2027 | Saint Lucia |
| Brunei National Day | Tuesday, 23 February 2027 | Brunei |
| Guyana Republic Day | Tuesday, 23 February 2027 | Guyana |
| Japan Emperor’s Birthday | Tuesday, 23 February 2027 | Japan |
| Estonia Independence Day | Wednesday, 24 February 2027 | Estonia |
| Kuwait National Day | Thursday, 25 February 2027 | Kuwait |
| International Polar Bear Day | Saturday, 27 February 2027 | Worldwide |
| National Cigar Day | Saturday, 27 February 2027 | United States |
| Dominican Republic Independence Day | Saturday, 27 February 2027 | Dominican Republic |
| World NGO Day | Saturday, 27 February 2027 | Worldwide |
| Pokémon Day | Saturday, 27 February 2027 | Worldwide |
| Rare Disease Day | Sunday, 28 February 2027 | Worldwide |
| World Compliment Day | Monday, 1 March 2027 | Worldwide |
| Zero Discrimination Day | Monday, 1 March 2027 | Worldwide |
| World Seagrass Day | Monday, 1 March 2027 | Worldwide |
| Women's History Month | 1 March 2027 to 31 March 2027 | Worldwide |
| World Wildlife Day | Wednesday, 3 March 2027 | Worldwide |
| World Hearing Day | Wednesday, 3 March 2027 | Worldwide |
| Bulgaria National Day | Wednesday, 3 March 2027 | Bulgaria |
| World Engineering Day for Sustainable Development | Thursday, 4 March 2027 | Worldwide |
| World Obesity Day | Thursday, 4 March 2027 | Worldwide |
| World Book Day | Thursday, 4 March 2027 | Ireland , United Kingdom |
| International Day for Disarmament and Non-Proliferation Awareness | Friday, 5 March 2027 | Worldwide |
| Ghana Independence Day | Saturday, 6 March 2027 | Ghana |
| Mother's Day | Sunday, 7 March 2027 | United Kingdom |
| Sunday, 9 May 2027 | United States | |
| International Women's Day | Monday, 8 March 2027 | Worldwide |
| Mario Day | Wednesday, 10 March 2027 | Worldwide |
| International Day of Women Judges | Wednesday, 10 March 2027 | Worldwide |
| World Kidney Day | Thursday, 11 March 2027 | Worldwide |
| European Day of Remembrance of Victims of Terrorism | Thursday, 11 March 2027 | Europe |
| Mauritius National Day | Friday, 12 March 2027 | Mauritius |
| Daylight Saving Time Starts | Sunday, 14 March 2027 | United States |
| Sunday, 28 March 2027 | Europe , United Kingdom | |
| Pi Day | Sunday, 14 March 2027 | Worldwide |
| White Day | Sunday, 14 March 2027 | Worldwide |
| International Day of Mathematics | Sunday, 14 March 2027 | Worldwide |
| International Day to Combat Islamophobia | Monday, 15 March 2027 | Worldwide |
| St Patrick's Day | Wednesday, 17 March 2027 | Worldwide |
| International Clients' Day | Friday, 19 March 2027 | Worldwide |
| International Day for Digital Learning | Friday, 19 March 2027 | Worldwide |
| World Sleep Day | Friday, 19 March 2027 | Worldwide |
| Spring Equinox | Saturday, 20 March 2027 | Worldwide |
| International Day of Happiness | Saturday, 20 March 2027 | Worldwide |
| French Language Day | Saturday, 20 March 2027 | Worldwide |
| Tunisia Independence Day | Saturday, 20 March 2027 | Tunisia |
| Palm Sunday | Sunday, 21 March 2027 | Worldwide |
| International Day for the Elimination of Racial Discrimination | Sunday, 21 March 2027 | Worldwide |
| World Poetry Day | Sunday, 21 March 2027 | Worldwide |
| International Day of Nowruz | Sunday, 21 March 2027 | Worldwide |
| World Down Syndrome Day | Sunday, 21 March 2027 | Worldwide |
| World Day for Glaciers | Sunday, 21 March 2027 | Worldwide |
| International Day of Forests | Sunday, 21 March 2027 | Worldwide |
| Namibia Independence Day | Sunday, 21 March 2027 | Namibia |
| Week of Solidarity with the Peoples Struggling against Racism and Racial Discrimination | 21 March 2027 to 27 March 2027 | Worldwide |
| World Water Day | Monday, 22 March 2027 | Worldwide |
| World Meteorological Day | Tuesday, 23 March 2027 | Worldwide |
| Pakistan Day | Tuesday, 23 March 2027 | Pakistan |
| National Puppy Day | Tuesday, 23 March 2027 | United States |
| World Tuberculosis Day | Wednesday, 24 March 2027 | Worldwide |
| International Day for the Right to the Truth concerning Gross Human Rights Violations and for the Dignity of Victims | Wednesday, 24 March 2027 | Worldwide |
| Maundy Thursday | Thursday, 25 March 2027 | Worldwide |
| International Day of Remembrance of the Victims of Slavery and the Transatlantic Slave Trade | Thursday, 25 March 2027 | Worldwide |
| International Day of Solidarity with Detained and Missing Staff Members | Thursday, 25 March 2027 | Worldwide |
| Tolkien Reading Day | Thursday, 25 March 2027 | Worldwide |
| Greek Independence Day | Thursday, 25 March 2027 | Greece |
| Waffle Day | Thursday, 25 March 2027 | Sweden |
| Good Friday | Friday, 26 March 2027 | Worldwide |
| Bangladesh Independence Day | Friday, 26 March 2027 | Bangladesh |
| World Theatre Day | Saturday, 27 March 2027 | Worldwide |
| Easter Sunday | Sunday, 28 March 2027 | Worldwide |
| Easter Monday | Monday, 29 March 2027 | United Kingdom |
| International Day of Zero Waste | Tuesday, 30 March 2027 | Worldwide |
| International Transgender Day of Visibility | Wednesday, 31 March 2027 | Worldwide |
| World Backup Day | Wednesday, 31 March 2027 | Worldwide |
| April Fools' Day | Thursday, 1 April 2027 | Worldwide |
| World Autism Awareness Day | Friday, 2 April 2027 | Worldwide |
| International Day for Mine Awareness and Assistance in Mine Action | Sunday, 4 April 2027 | Worldwide |
| Angola Peace Day | Sunday, 4 April 2027 | Angola |
| Senegal Independence Day | Sunday, 4 April 2027 | Senegal |
| International Day of Conscience | Monday, 5 April 2027 | Worldwide |
| International Day of Sport for Development and Peace | Tuesday, 6 April 2027 | Worldwide |
| World Health Day | Wednesday, 7 April 2027 | Worldwide |
| International Day of Reflection on the 1994 Genocide against the Tutsi in Rwanda | Wednesday, 7 April 2027 | Worldwide |
| Global Work From Home Day | Saturday, 10 April 2027 | Worldwide |
| Memon Day | Saturday, 10 April 2027 | Worldwide |
| Siblings Day | Saturday, 10 April 2027 | Worldwide |
| World Parkinson's Day | Sunday, 11 April 2027 | Worldwide |
| International Day of Human Space Flight | Monday, 12 April 2027 | Worldwide |
| Yuri's Night | Monday, 12 April 2027 | Worldwide |
| World Chagas Disease Day | Wednesday, 14 April 2027 | Worldwide |
| World Art Day | Thursday, 15 April 2027 | Worldwide |
| International Wellness Day | Thursday, 15 April 2027 | Worldwide |
| Record Store Day | Saturday, 17 April 2027 | Worldwide |
| Syria Evacuation Day | Saturday, 17 April 2027 | Syria |
| International Day for Monuments and Sites | Sunday, 18 April 2027 | Worldwide |
| Zimbabwe Independence Day | Sunday, 18 April 2027 | Zimbabwe |
| Bicycle Day | Monday, 19 April 2027 | Worldwide |
| Marathon Monday | Monday, 19 April 2027 | United States |
| 4/20 | Tuesday, 20 April 2027 | Worldwide |
| Chinese Language Day | Tuesday, 20 April 2027 | Worldwide |
| World Creativity and Innovation Day | Wednesday, 21 April 2027 | Worldwide |
| Earth Day | Thursday, 22 April 2027 | Worldwide |
| International Girls in ICT Day | Thursday, 22 April 2027 | Worldwide |
| ZX Spectrum Day | Friday, 23 April 2027 | Worldwide |
| World Book and Copyright Day | Friday, 23 April 2027 | Worldwide |
| English Language Day | Friday, 23 April 2027 | Worldwide |
| Spanish Language Day | Friday, 23 April 2027 | Worldwide |
| Shakespeare Day | Friday, 23 April 2027 | United Kingdom |
| International Day of Multilateralism and Diplomacy for Peace | Saturday, 24 April 2027 | Worldwide |
| Armenian Genocide Victims Remembrance Day | Saturday, 24 April 2027 | Armenia |
| World Immunization Week | 24 April 2027 to 30 April 2027 | Worldwide |
| World Malaria Day | Sunday, 25 April 2027 | Worldwide |
| International Delegate's Day | Sunday, 25 April 2027 | Worldwide |
| National DNA Day | Sunday, 25 April 2027 | United States |
| National First Ladies Day | Monday, 26 April 2027 | United States |
| International Chernobyl Disaster Remembrance Day | Monday, 26 April 2027 | Worldwide |
| World Intellectual Property Day | Monday, 26 April 2027 | Worldwide |
| Tanzania Union Day | Monday, 26 April 2027 | Tanzania |
| Alien Day | Monday, 26 April 2027 | Worldwide |
| King's Day | Tuesday, 27 April 2027 | Netherlands |
| Sierra Leone Independence Day | Tuesday, 27 April 2027 | Sierra Leone |
| South Africa Freedom Day | Tuesday, 27 April 2027 | South Africa |
| Togo Independence Day | Tuesday, 27 April 2027 | Togo |
| Administrative Professionals Day | Wednesday, 28 April 2027 | United States |
| World Day for Safety and Health at Work | Wednesday, 28 April 2027 | Worldwide |
| International Guide Dog Day | Wednesday, 28 April 2027 | Worldwide |
| International Day in Memory of the Victims of Earthquakes | Thursday, 29 April 2027 | Worldwide |
| International Dance Day | Thursday, 29 April 2027 | Worldwide |
| International Jazz Day | Friday, 30 April 2027 | Worldwide |
| Free Comic Book Day | Saturday, 1 May 2027 | Worldwide |
| Marshall Islands Constitution Day | Saturday, 1 May 2027 | Marshall Islands |
| World Tuna Day | Sunday, 2 May 2027 | Worldwide |
| Early May Bank Holiday | Monday, 3 May 2027 | United Kingdom |
| World Press Freedom Day | Monday, 3 May 2027 | Worldwide |
| Poland Constitution Day | Monday, 3 May 2027 | Poland |
| Star Wars Day | Tuesday, 4 May 2027 | Worldwide |
| Remembrance Day | Tuesday, 4 May 2027 | Netherlands |
| Cinco de Mayo | Wednesday, 5 May 2027 | Worldwide |
| World Portuguese Language Day | Wednesday, 5 May 2027 | Worldwide |
| African World Heritage Day | Wednesday, 5 May 2027 | Worldwide |
| World Hand Hygiene Day | Wednesday, 5 May 2027 | Worldwide |
| Revenge of the Fifth | Wednesday, 5 May 2027 | Worldwide |
| World Password Day | Thursday, 6 May 2027 | Worldwide |
| No Pants Day | Friday, 7 May 2027 | Worldwide |
| Time of Remembrance and Reconciliation for Those Who Lost Their Lives During the Second World War | 8 May 2027 to 9 May 2027 | Worldwide |
| Europe Day | Sunday, 9 May 2027 | Europe |
| International Day of Argania | Monday, 10 May 2027 | Worldwide |
| International Nurses Day | Wednesday, 12 May 2027 | Worldwide |
| International Day of Plant Health | Wednesday, 12 May 2027 | Worldwide |
| Paraguay Independence Day | 14 May 2027 to 15 May 2027 | Paraguay |
| International Day of Families | Saturday, 15 May 2027 | Worldwide |
| International Day of Living Together in Peace | Sunday, 16 May 2027 | Worldwide |
| International Day of Light | Sunday, 16 May 2027 | Worldwide |
| Pentecost | Sunday, 16 May 2027 | Europe |
| World Telecommunication and Information Society Day | Monday, 17 May 2027 | Worldwide |
| Norway Constitution Day | Monday, 17 May 2027 | Norway |
| International Museum Day | Tuesday, 18 May 2027 | Worldwide |
| World Fair Play Day | Wednesday, 19 May 2027 | Worldwide |
| Global Accessibility Awareness Day | Thursday, 20 May 2027 | Worldwide |
| World Bee Day | Thursday, 20 May 2027 | Worldwide |
| World Metrology Day | Thursday, 20 May 2027 | Worldwide |
| Cameroon National Day | Thursday, 20 May 2027 | Cameroon |
| Timor-Leste Restoration of Independence Day | Thursday, 20 May 2027 | Timor-Leste |
| National Day of Remembrance | Thursday, 20 May 2027 | Cambodia |
| International Tea Day | Friday, 21 May 2027 | Worldwide |
| World Day for Cultural Diversity for Dialogue and Development | Friday, 21 May 2027 | Worldwide |
| International Day for Biological Diversity | Saturday, 22 May 2027 | Worldwide |
| Yemen Unification Day | Saturday, 22 May 2027 | Yemen |
| World Goth Day | Saturday, 22 May 2027 | Worldwide |
| International Day to End Obstetric Fistula | Sunday, 23 May 2027 | Worldwide |
| International Day of the Markhor | Monday, 24 May 2027 | Worldwide |
| Battle of Pichincha Day | Monday, 24 May 2027 | Ecuador |
| Eritrea Independence Day | Monday, 24 May 2027 | Eritrea |
| World Football Day | Tuesday, 25 May 2027 | Worldwide |
| Africa Day | Tuesday, 25 May 2027 | Worldwide |
| May Revolution Day | Tuesday, 25 May 2027 | Argentina |
| Jordan Independence Day | Tuesday, 25 May 2027 | Jordan |
| Geek Pride Day | Tuesday, 25 May 2027 | Worldwide |
| Towel Day | Tuesday, 25 May 2027 | Worldwide |
| Week of Solidarity with the Peoples of Non-Self-Governing Territories | 25 May 2027 to 31 May 2027 | Worldwide |
| Georgia Independence Day | Wednesday, 26 May 2027 | Georgia |
| World Dracula Day | Wednesday, 26 May 2027 | Worldwide |
| International Burger Day | Friday, 28 May 2027 | Worldwide |
| Menstrual Hygiene Day | Friday, 28 May 2027 | Worldwide |
| Azerbaijan Independence Day | Friday, 28 May 2027 | Azerbaijan |
| International Day of UN Peacekeepers | Saturday, 29 May 2027 | Worldwide |
| International Day of Potato | Sunday, 30 May 2027 | Worldwide |
| Croatia Statehood Day | Sunday, 30 May 2027 | Croatia |
| Memorial Day | Monday, 31 May 2027 | United States |
| Spring Bank Holiday | Monday, 31 May 2027 | United Kingdom |
| World No Tobacco Day | Monday, 31 May 2027 | Worldwide |
| Global Day of Parents | Tuesday, 1 June 2027 | Worldwide |
| Samoa Independence Day | Tuesday, 1 June 2027 | Samoa |
| Pride Month | 1 June 2027 to 30 June 2027 | Worldwide |
| Men's Health Month | 1 June 2027 to 30 June 2027 | United States |
| Italy Republic Day | Wednesday, 2 June 2027 | Italy |
| World Bicycle Day | Thursday, 3 June 2027 | Worldwide |
| International Day of Innocent Children Victims of Aggression | Friday, 4 June 2027 | Worldwide |
| Tonga Emancipation Day | Friday, 4 June 2027 | Tonga |
| World Environment Day | Saturday, 5 June 2027 | Worldwide |
| International Day for the Fight against Illegal, Unreported and Unregulated Fishing | Saturday, 5 June 2027 | Worldwide |
| Denmark Constitution Day | Saturday, 5 June 2027 | Denmark |
| National Cancer Survivors Day | Sunday, 6 June 2027 | United States |
| Russian Language Day | Sunday, 6 June 2027 | Worldwide |
| Sweden National Day | Sunday, 6 June 2027 | Sweden |
| World Food Safety Day | Monday, 7 June 2027 | Worldwide |
| World Oceans Day | Tuesday, 8 June 2027 | Worldwide |
| International Day for Dialogue among Civilizations | Thursday, 10 June 2027 | Worldwide |
| Portugal Day | Thursday, 10 June 2027 | Portugal |
| International Day of Play | Friday, 11 June 2027 | Worldwide |
| World Day Against Child Labour | Saturday, 12 June 2027 | Worldwide |
| Philippines Independence Day | Saturday, 12 June 2027 | Philippines |
| Russia Day | Saturday, 12 June 2027 | Russia |
| International Albinism Awareness Day | Sunday, 13 June 2027 | Worldwide |
| World Blood Donor Day | Monday, 14 June 2027 | Worldwide |
| World Elder Abuse Awareness Day | Tuesday, 15 June 2027 | Worldwide |
| Bloomsday | Wednesday, 16 June 2027 | Worldwide |
| International Day of Family Remittances | Wednesday, 16 June 2027 | Worldwide |
| World Day to Combat Desertification and Drought | Thursday, 17 June 2027 | Worldwide |
| Iceland National Day | Thursday, 17 June 2027 | Iceland |
| Sustainable Gastronomy Day | Friday, 18 June 2027 | Worldwide |
| International Day for Countering Hate Speech | Friday, 18 June 2027 | Worldwide |
| Autistic Pride Day | Friday, 18 June 2027 | Worldwide |
| Seychelles Constitution Day | Friday, 18 June 2027 | Seychelles |
| Juneteenth | Saturday, 19 June 2027 | United States |
| International Day for the Elimination of Sexual Violence in Conflict | Saturday, 19 June 2027 | Worldwide |
| World Sickle Cell Day | Saturday, 19 June 2027 | Worldwide |
| World Juggling Day | Saturday, 19 June 2027 | Worldwide |
| Father's Day | Sunday, 20 June 2027 | Worldwide |
| World Refugee Day | Sunday, 20 June 2027 | Worldwide |
| International Day of Yoga | Monday, 21 June 2027 | Worldwide |
| International Day of the Celebration of the Solstice | Monday, 21 June 2027 | Worldwide |
| Make Music Day | Monday, 21 June 2027 | Worldwide |
| Summer Solstice | Monday, 21 June 2027 | Worldwide |
| United Nations Public Service Day | Wednesday, 23 June 2027 | Worldwide |
| International Widows' Day | Wednesday, 23 June 2027 | Worldwide |
| Luxembourg National Day | Wednesday, 23 June 2027 | Luxembourg |
| National Day of Remembrance for Victims of Terrorism | Wednesday, 23 June 2027 | Canada |
| International Day of Women in Diplomacy | Thursday, 24 June 2027 | Worldwide |
| Day of the Seafarer | Friday, 25 June 2027 | Worldwide |
| Mozambique Independence Day | Friday, 25 June 2027 | Mozambique |
| Slovenia Statehood Day | Friday, 25 June 2027 | Slovenia |
| International Day against Drug Abuse and Illicit Trafficking | Saturday, 26 June 2027 | Worldwide |
| United Nations International Day in Support of Victims of Torture | Saturday, 26 June 2027 | Worldwide |
| Madagascar Independence Day | Saturday, 26 June 2027 | Madagascar |
| International Day of Deafblindness | Sunday, 27 June 2027 | Worldwide |
| Micro-, Small and Medium-sized Enterprises Day | Sunday, 27 June 2027 | Worldwide |
| Djibouti Independence Day | Sunday, 27 June 2027 | Djibouti |
| International LGBTQI+ Day | Monday, 28 June 2027 | Worldwide |
| International Day of the Tropics | Tuesday, 29 June 2027 | Worldwide |
| Seychelles Independence Day | Tuesday, 29 June 2027 | Seychelles |
| Asteroid Day | Wednesday, 30 June 2027 | Worldwide |
| International Day of Parliamentarism | Wednesday, 30 June 2027 | Worldwide |
| Democratic Republic of the Congo Independence Day | Wednesday, 30 June 2027 | Democratic Republic of the Congo |
| Canada Day | Thursday, 1 July 2027 | Canada |
| Burundi Independence Day | Thursday, 1 July 2027 | Burundi |
| Somalia Independence Day | Thursday, 1 July 2027 | Somalia |
| Rwanda Independence Day | Thursday, 1 July 2027 | Rwanda |
| World UFO Day | Friday, 2 July 2027 | Worldwide |
| Comic Sans Day | Friday, 2 July 2027 | Worldwide |
| International Day of Cooperatives | Saturday, 3 July 2027 | Worldwide |
| Belarus Independence Day | Saturday, 3 July 2027 | Belarus |
| Independence Day | Sunday, 4 July 2027 | United States |
| Rwanda Liberation Day | Sunday, 4 July 2027 | Rwanda |
| Cabo Verde Independence Day | Monday, 5 July 2027 | Cabo Verde |
| Venezuela Independence Day | Monday, 5 July 2027 | Venezuela |
| World Rural Development Day | Tuesday, 6 July 2027 | Worldwide |
| Comoros Independence Day | Tuesday, 6 July 2027 | Comoros |
| Malawi Independence Day | Tuesday, 6 July 2027 | Malawi |
| International Kissing Day | Tuesday, 6 July 2027 | Worldwide |
| World Kiswahili Language Day | Wednesday, 7 July 2027 | Worldwide |
| Solomon Islands Independence Day | Wednesday, 7 July 2027 | Solomon Islands |
| World Chocolate Day | Wednesday, 7 July 2027 | Worldwide |
| South Sudan Independence Day | Friday, 9 July 2027 | South Sudan |
| Bahamas Independence Day | Saturday, 10 July 2027 | The Bahamas |
| International Day of Reflection and Commemoration of the 1995 Genocide in Srebrenica | Sunday, 11 July 2027 | Worldwide |
| World Population Day | Sunday, 11 July 2027 | Worldwide |
| World Horse Day | Sunday, 11 July 2027 | Worldwide |
| Naadam | 11 July 2027 to 15 July 2027 | Mongolia |
| International Day of Combating Sand and Dust Storms | Monday, 12 July 2027 | Worldwide |
| International Day of Hope | Monday, 12 July 2027 | Worldwide |
| Kiribati Independence Day | Monday, 12 July 2027 | Kiribati |
| São Tomé and Príncipe Independence Day | Monday, 12 July 2027 | São Tomé and Príncipe |
| Montenegro Statehood Day | Tuesday, 13 July 2027 | Montenegro |
| Embrace Your Geekness Day | Tuesday, 13 July 2027 | Worldwide |
| French National Day | Wednesday, 14 July 2027 | France |
| International Non-Binary People's Day | Wednesday, 14 July 2027 | Worldwide |
| World Youth Skills Day | Thursday, 15 July 2027 | Worldwide |
| World Snake Day | Friday, 16 July 2027 | Worldwide |
| World Emoji Day | Saturday, 17 July 2027 | Worldwide |
| Nelson Mandela International Day | Sunday, 18 July 2027 | Worldwide |
| National Ice Cream Day | Sunday, 18 July 2027 | United States |
| World Chess Day | Tuesday, 20 July 2027 | Worldwide |
| International Moon Day | Tuesday, 20 July 2027 | Worldwide |
| Colombia Independence Day | Tuesday, 20 July 2027 | Colombia |
| Belgium National Day | Wednesday, 21 July 2027 | Belgium |
| Egypt Revolution Day | Friday, 23 July 2027 | Egypt |
| International Day of Women and Girls of African Descent | Sunday, 25 July 2027 | Worldwide |
| World Drowning Prevention Day | Sunday, 25 July 2027 | Worldwide |
| International Day for Judicial Well-being | Sunday, 25 July 2027 | Worldwide |
| Parents' Day | Sunday, 25 July 2027 | United States |
| International Day for the Conservation of the Mangrove Ecosystem | Monday, 26 July 2027 | Worldwide |
| Liberia Independence Day | Monday, 26 July 2027 | Liberia |
| Maldives Independence Day | Monday, 26 July 2027 | Maldives |
| Peru Independence Day | Wednesday, 28 July 2027 | Peru |
| World Hepatitis Day | Wednesday, 28 July 2027 | Worldwide |
| International Tiger Day | Thursday, 29 July 2027 | Worldwide |
| International Day of Friendship | Friday, 30 July 2027 | Worldwide |
| World Day against Trafficking in Persons | Friday, 30 July 2027 | Worldwide |
| Morocco Throne Day | Friday, 30 July 2027 | Morocco |
| Vanuatu Independence Day | Friday, 30 July 2027 | Vanuatu |
| System Administrator Appreciation Day | Friday, 30 July 2027 | Worldwide |
| Friendship Day | Sunday, 1 August 2027 | Worldwide |
| Benin Independence Day | Sunday, 1 August 2027 | Benin |
| Switzerland National Day | Sunday, 1 August 2027 | Switzerland |
| World Breastfeeding Week | 1 August 2027 to 7 August 2027 | Worldwide |
| Cook Islands Constitution Day | Wednesday, 4 August 2027 | Cook Islands |
| International Day of Awareness of the Special Development Needs and Challenges of Landlocked Developing Countries | Friday, 6 August 2027 | Worldwide |
| Bolivia Independence Day | Friday, 6 August 2027 | Bolivia |
| Jamaica Independence Day | Friday, 6 August 2027 | Jamaica |
| International Beer Day | Friday, 6 August 2027 | Worldwide |
| Côte d'Ivoire Independence Day | Saturday, 7 August 2027 | Côte d’Ivoire |
| International Cat Day | Sunday, 8 August 2027 | Worldwide |
| Infinity Day | Sunday, 8 August 2027 | Worldwide |
| International Day of the World's Indigenous Peoples | Monday, 9 August 2027 | Worldwide |
| Singapore National Day | Monday, 9 August 2027 | Singapore |
| Book Lovers Day | Monday, 9 August 2027 | Worldwide |
| World Steelpan Day | Wednesday, 11 August 2027 | Worldwide |
| Chad Independence Day | Wednesday, 11 August 2027 | Chad |
| International Youth Day | Thursday, 12 August 2027 | Worldwide |
| International Left-Handers Day | Friday, 13 August 2027 | Worldwide |
| Independence Day (Pakistan) | Saturday, 14 August 2027 | Pakistan |
| Independence Day (India) | Sunday, 15 August 2027 | India |
| Republic of the Congo Independence Day | Sunday, 15 August 2027 | Republic of the Congo |
| Liechtenstein National Day | Sunday, 15 August 2027 | Liechtenstein |
| National Relaxation Day | Sunday, 15 August 2027 | United States |
| Black Cat Appreciation Day | Tuesday, 17 August 2027 | United States |
| Gabon Independence Day | Tuesday, 17 August 2027 | Gabon |
| Indonesia Independence Day | Tuesday, 17 August 2027 | Indonesia |
| World Humanitarian Day | Thursday, 19 August 2027 | Worldwide |
| World Photography Day | Thursday, 19 August 2027 | Worldwide |
| Afghanistan Independence Day | Thursday, 19 August 2027 | Afghanistan |
| Hungary State Foundation Day | Friday, 20 August 2027 | Hungary |
| International Day of Remembrance and Tribute to the Victims of Terrorism | Saturday, 21 August 2027 | Worldwide |
| International Day for the Commemoration of the Dignity of Victims of Serious Crimes of International Concern | Saturday, 21 August 2027 | Worldwide |
| International Day for Underwater Cultural Heritage | Saturday, 21 August 2027 | Worldwide |
| International Day Commemorating the Victims of Acts of Violence Based on Religion or Belief | Sunday, 22 August 2027 | Worldwide |
| International Day for the Remembrance of the Slave Trade and its Abolition | Monday, 23 August 2027 | Worldwide |
| European Day of Remembrance for Victims of Stalinism and Nazism | Monday, 23 August 2027 | Europe |
| Ukraine Independence Day | Tuesday, 24 August 2027 | Ukraine |
| Pluto Demoted Day | Tuesday, 24 August 2027 | Worldwide |
| Uruguay Independence Day | Wednesday, 25 August 2027 | Uruguay |
| Women's Equality Day | Thursday, 26 August 2027 | United States |
| National Dog Day | Thursday, 26 August 2027 | United States |
| World Lake Day | Friday, 27 August 2027 | Worldwide |
| Moldova Independence Day | Friday, 27 August 2027 | Moldova |
| International Bat Night | 28 August 2027 to 29 August 2027 | Worldwide |
| International Day against Nuclear Tests | Sunday, 29 August 2027 | Worldwide |
| World Video Game Day | Sunday, 29 August 2027 | Spain |
| International Day of the Victims of Enforced Disappearances | Monday, 30 August 2027 | Worldwide |
| Summer Bank Holiday | Monday, 30 August 2027 | United Kingdom |
| International Day for People of African Descent | Tuesday, 31 August 2027 | Worldwide |
| Kyrgyzstan Independence Day | Tuesday, 31 August 2027 | Kyrgyzstan |
| Trinidad and Tobago Independence Day | Tuesday, 31 August 2027 | Trinidad and Tobago |
| Malaysia National Day | Tuesday, 31 August 2027 | Malaysia |
| Constitution Day of the Slovak Republic | Wednesday, 1 September 2027 | Slovakia |
| Uzbekistan Independence Day | Wednesday, 1 September 2027 | Uzbekistan |
| Vietnam National Day | Thursday, 2 September 2027 | Vietnam |
| Feast of Saint Marinus and Foundation of the Republic Day | Friday, 3 September 2027 | San Marino |
| World Beard Day | Saturday, 4 September 2027 | Worldwide |
| World Sexual Health Day | Saturday, 4 September 2027 | Worldwide |
| International Day of Charity | Sunday, 5 September 2027 | Worldwide |
| International Day of the World's Indigenous Women and Girls | Sunday, 5 September 2027 | Worldwide |
| Eswatini Independence Day | Monday, 6 September 2027 | Eswatini |
| Labor Day | Monday, 6 September 2027 | United States |
| Brazil Independence Day | Tuesday, 7 September 2027 | Brazil |
| International Day of Clean Air for Blue Skies | Tuesday, 7 September 2027 | Worldwide |
| International Day of Police Cooperation | Tuesday, 7 September 2027 | Worldwide |
| World Duchenne Awareness Day | Tuesday, 7 September 2027 | Worldwide |
| Andorra National Day | Wednesday, 8 September 2027 | Andorra |
| International Literacy Day | Wednesday, 8 September 2027 | Worldwide |
| North Macedonia Independence Day | Wednesday, 8 September 2027 | North Macedonia |
| Star Trek Day | Wednesday, 8 September 2027 | Worldwide |
| World PT Day | Wednesday, 8 September 2027 | Worldwide |
| International Day to Protect Education from Attack | Thursday, 9 September 2027 | Worldwide |
| Tajikistan Independence Day | Thursday, 9 September 2027 | Tajikistan |
| World Suicide Prevention Day | Friday, 10 September 2027 | Worldwide |
| United Nations Day for South-South Cooperation | Sunday, 12 September 2027 | Worldwide |
| National Video Games Day | Sunday, 12 September 2027 | United States |
| International Day of Caves and Karst | Monday, 13 September 2027 | Worldwide |
| Programmers' Day | Monday, 13 September 2027 | Worldwide |
| World Sepsis Day | Monday, 13 September 2027 | Worldwide |
| Costa Rica Independence Day | Wednesday, 15 September 2027 | Costa Rica |
| El Salvador Independence Day | Wednesday, 15 September 2027 | El Salvador |
| Guatemala Independence Day | Wednesday, 15 September 2027 | Guatemala |
| Honduras Independence Day | Wednesday, 15 September 2027 | Honduras |
| International Day of Democracy | Wednesday, 15 September 2027 | Worldwide |
| Nicaragua Independence Day | Wednesday, 15 September 2027 | Nicaragua |
| World Lymphoma Awareness Day | Wednesday, 15 September 2027 | Worldwide |
| International Day for Interventional Cardiology | Thursday, 16 September 2027 | Worldwide |
| International Day for the Preservation of the Ozone Layer | Thursday, 16 September 2027 | Worldwide |
| International Day of Science, Technology and Innovation for the South | Thursday, 16 September 2027 | Worldwide |
| Malaysia Day | Thursday, 16 September 2027 | Malaysia |
| Mexico Independence Day | Thursday, 16 September 2027 | Mexico |
| Papua New Guinea Independence Day | Thursday, 16 September 2027 | Papua New Guinea |
| T-Shirt Day | Thursday, 16 September 2027 | United Kingdom |
| World Patient Safety Day | Friday, 17 September 2027 | Worldwide |
| Batman Day | Saturday, 18 September 2027 | Worldwide |
| Chile National Day | Saturday, 18 September 2027 | Chile |
| International Equal Pay Day | Saturday, 18 September 2027 | Worldwide |
| Oktoberfest | 18 September 2027 to 3 October 2027 | Germany |
| Saint Kitts and Nevis Independence Day | Sunday, 19 September 2027 | Saint Kitts and Nevis |
| Talk Like a Pirate Day | Sunday, 19 September 2027 | Worldwide |
| International Day of University Sport | Monday, 20 September 2027 | Worldwide |
| World Cleanup Day | Monday, 20 September 2027 | Worldwide |
| Armenia Independence Day | Tuesday, 21 September 2027 | Armenia |
| Belize Independence Day | Tuesday, 21 September 2027 | Belize |
| Malta Independence Day | Tuesday, 21 September 2027 | Malta |
| World Alzheimer's Day | Tuesday, 21 September 2027 | Worldwide |
| World Peace Day | Tuesday, 21 September 2027 | Worldwide |
| Mali Independence Day | Wednesday, 22 September 2027 | Mali |
| World Car Free Day | Wednesday, 22 September 2027 | Worldwide |
| Hobbit Day | Wednesday, 22 September 2027 | Worldwide |
| International Day of Sign Languages | Thursday, 23 September 2027 | Worldwide |
| International GNSS Day | Thursday, 23 September 2027 | Worldwide |
| Celebrate Bisexuality Day | Thursday, 23 September 2027 | Worldwide |
| Saudi National Day | Thursday, 23 September 2027 | Saudi Arabia |
| Autumn Equinox | Thursday, 23 September 2027 | Worldwide |
| Guinea-Bissau Independence Day | Friday, 24 September 2027 | Guinea-Bissau |
| Heritage Day | Friday, 24 September 2027 | South Africa |
| World Lung Day | Saturday, 25 September 2027 | Worldwide |
| World Pharmacists Day | Saturday, 25 September 2027 | Worldwide |
| International Day for the Total Elimination of Nuclear Weapons | Sunday, 26 September 2027 | Worldwide |
| World Tourism Day | Monday, 27 September 2027 | Worldwide |
| Remembrance Day | Monday, 27 September 2027 | Azerbaijan |
| International Day for Universal Access to Information | Tuesday, 28 September 2027 | Worldwide |
| World Rabies Day | Tuesday, 28 September 2027 | Worldwide |
| International Day of Awareness of Food Loss and Waste | Wednesday, 29 September 2027 | Worldwide |
| National Coffee Day | Wednesday, 29 September 2027 | United States |
| World Heart Day | Wednesday, 29 September 2027 | Worldwide |
| National Police Remembrance Day | Wednesday, 29 September 2027 | Australia |
| Police Remembrance Day | Wednesday, 29 September 2027 | New Zealand |
| Botswana Day | Thursday, 30 September 2027 | Botswana |
| International Translation Day | Thursday, 30 September 2027 | Worldwide |
| World Maritime Day | Thursday, 30 September 2027 | Worldwide |
| China National Day | Friday, 1 October 2027 | China |
| Cyprus Independence Day | Friday, 1 October 2027 | Cyprus |
| International Coffee Day | Friday, 1 October 2027 | Worldwide |
| International Day of Older Persons | Friday, 1 October 2027 | Worldwide |
| Nigeria Independence Day | Friday, 1 October 2027 | Nigeria |
| Palau Independence Day | Friday, 1 October 2027 | Palau |
| Tuvalu Independence Day | Friday, 1 October 2027 | Tuvalu |
| World Smile Day | Friday, 1 October 2027 | Worldwide |
| Guinea Independence Day | Saturday, 2 October 2027 | Guinea |
| International Day of Non-Violence | Saturday, 2 October 2027 | Worldwide |
| German Unity Day | Sunday, 3 October 2027 | Germany |
| Iraq National Day | Sunday, 3 October 2027 | Iraq |
| South Korea National Foundation Day | Sunday, 3 October 2027 | South Korea |
| Lesotho Independence Day | Monday, 4 October 2027 | Lesotho |
| World Animal Day | Monday, 4 October 2027 | Worldwide |
| World Habitat Day | Monday, 4 October 2027 | Worldwide |
| World Teachers' Day | Tuesday, 5 October 2027 | Worldwide |
| International Geodiversity Day | Wednesday, 6 October 2027 | Worldwide |
| Christmas Day (substitute holiday) | Monday, 27 December 2027 | United Kingdom |
| Leap Day | Tuesday, 29 February 2028 | Worldwide |
| World Statistics Day | Sunday, 20 October 2030 | Worldwide |