September
September 5 — International Day of Charity
United Nations — International Day of Charity
September 7 — International Day of Clean Air for Blue Skies
World Health Organization (WHO) — Air Pollution
United Nations — International Day of Clean Air for Blue Skies
September 7 — International Day of Police Cooperation
United Nations — International Day of Police Cooperation
September 8 — International Literacy Day
September 9 — International Day to Protect Education from Attack
Global Coalition to Protect Education from Attack (GCPEA) — Education Under Attack 2026
September 15 — International Day of Democracy
September 16 — International Day for the Preservation of the Ozone Layer
UNEP Ozone Secretariat — Facts and Figures on Ozone Protection
September 20 — World Cleanup Day
United Nations — World Cleanup Day
United Nations Environment Programme (UNEP) — Marine Litter Assessment in the Mediterranean
September 21 — International Day of Peace
Musée national Picasso-Paris — La Colombe
September 23 — International Day of Sign Languages
United Nations — International Day of Sign Languages
September 24 — World Maritime Day *
International Maritime Organization (IMO) — World Maritime Day
September 26 — International Day for the Total Elimination of Nuclear Weapons
United Nations — International Day for the Total Elimination of Nuclear Weapons
SIPRI — SIPRI Yearbook 2026: World Nuclear Forces
September 29 — International Day of Awareness of Food Loss and Waste
United Nations Environment Programme (UNEP) — Food Waste Index Report 2024
October
October 1 — International Day of Older Persons
United Nations — International Day of Older Persons
October 2 — International Day of Non-Violence
United Nations — International Day of Non-Violence
Gandhi Heritage Portal — The Dandi March
October 4–10 — World Space Week
World Space Week Association — World Space Week
NASA — Spot the Station: Frequently Asked Questions
OCTOBER 5 — WORLD TEACHERS’ DAY
Guinness World Records — Largest School by Pupils
Merriam-Webster — “School” Etymology
October 5 — World Habitat Day *
UN-Habitat — Strategic Plan 2026–2029
October 7 — World Cotton Day
United Nations — World Cotton Day
October 10 — World Migratory Bird Day *
Convention on Migratory Species (CMS) — World Migratory Bird Day
CMS — World Migratory Bird Day
U.S. Geological Survey (USGS) — Juvenile Bar-tailed Godwit “B6” Sets World Record
October 10 — World Mental Health Day
World Health Organization (WHO) — Mental Health of Adolescents
October 11 — International Day of the Girl Child
October 16 — World Food Day
October 23 — International Snow Leopard Day
Snow Leopard Trust — Snow Leopard Facts
World Wildlife Fund (WWF) — Snow Leopard Facts
October 24 — United Nations Day
United Nations — United Nations Day
October 31 — World Cities Day
United Nations — World Cities Day
U.S. Environmental Protection Agency (EPA) — Using Trees and Vegetation to Reduce Heat Islands
November
November 2 — International Day to End Impunity for Crimes Against Journalists
UNESCO — International Day to End Impunity for Crimes Against Journalists
November 5 — World Tsunami Awareness Day
UNESCO — World Tsunami Awareness Day
UNESCO-IOC Tsunami Programme — What to Do
November 10 — World Science Day for Peace and Development
November 16 — International Day for Tolerance
UNESCO — Declaration of Principles on Tolerance
November 15 — World Day of Remembrance for Road Traffic Victims *
World Health Organization (WHO) — Road Traffic Injuries
November 19, 2026 — World Philosophy Day (11/18/2027 – 11/16/2028 – 11/15/2029)
November 19 — World Toilet Day
November 20 — World Children’s Day
UNICEF — Convention on the Rights of the Child
November 21 — World Television Day
Guinness World Records — Largest TV Audience: Space Event
FIFA — FIFA World Cup Qatar 2022: Global Engagement & Audience Report
November 24 — World Conjoined Twins Day
United Nations — World Conjoined Twins Day
Cleveland Clinic — Conjoined Twins
November 26 — World Sustainable Transport Day
United Nations — World Sustainable Transport Day
International Energy Agency (IEA) — Energy Efficiency 2025: Transport
November 30 — Day of Remembrance for All Victims of Chemical Warfare
Organisation for the Prohibition of Chemical Weapons (OPCW) — OPCW by the Numbers
December
December 1 — World AIDS Day
World Health Organization (WHO) — HIV and AIDS
December 2 — International Day for the Abolition of Slavery
International Labour Organization (ILO) — Global Estimates of Modern Slavery
December 3 — International Day of Persons with Disabilities
World Health Organization (WHO) — Disability
December 5 — World Soil Day
Food and Agriculture Organization of the United Nations (FAO) — World Soil Day
December 5 — International Volunteer Day
United Nations Volunteers (UNV) — State of the World’s Volunteerism Report 2026
December 7 — International Civil Aviation Day
International Civil Aviation Organization (ICAO) — Annual Report of the Council 2024
ICAO — Annual Report of the Council 2024
December 10 — Human Rights Day
United Nations — Universal Declaration of Human Rights
December 11 — International Mountain Day
United Nations — International Mountain Day
United Nations — Resolution 57/245, International Year of Mountains 2002
December 18 — International Migrants Day
United Nations — International Migrants Day
December 20 — International Human Solidarity Day
United Nations — International Human Solidarity Day
December 21 — World Meditation Day
United Nations — World Meditation Day
December 21 — World Basketball Day
January
January 4 — World Braille Day
United Nations — World Braille Day
January 11 — Thank You Day*
Informal observance; not an official United Nations International Day.
Days of the Year — International Thank-You Day
January 24 — International Day of Education
UNESCO — International Day of Education
January 26 — International Day of Clean Energy
United Nations — International Day of Clean Energy
IRENA — UN Declares IRENA’s Founding Date as International Day for Clean Energy
IRENA — Renewable Capacity Statistics 2025
January 27 — International Day of Commemoration in Memory of the Victims of the Holocaust
United Nations — International Day of Commemoration in Memory of the Victims of the Holocaust
United States Holocaust Memorial Museum — Introduction to the Holocaust
January 28 — International Day of Peaceful Coexistence
February
February 1–7 — World Interfaith Harmony Week
United Nations — World Interfaith Harmony Week
February 2 — World Wetlands Day
Convention on Wetlands — World Wetlands Day
Convention on Wetlands — Global Wetland Outlook
February 4 — International Day of Human Fraternity
United Nations — International Day of Human Fraternity
February 10 — International Day of the Arabian Leopard
United Nations — International Day of the Arabian Leopard
February 11 — International Day of Women and Girls in Science
United Nations — International Day of Women and Girls in Science
February 13 — World Radio Day
IEEE REACH — Crystal Radio: Radio Inquiry Unit
February 17 — Global Tourism Resilience Day
United Nations — Global Tourism Resilience Day
February 17 — Random Acts of Kindness Day*
Random Acts of Kindness Foundation — Random Acts of Kindness Day
Informal observance; not an official United Nations International Day.
February 20 — World Day of Social Justice
United Nations — World Day of Social Justice
February 20 — World Day of Social Justice
ILO — Nearly 138 million children in child labour in 2024
February 21 — International Mother Language Day
March
March 1 — Zero Discrimination Day
UNAIDS — Zero Discrimination Day
March 3 — World Wildlife Day
United Nations — World Wildlife Day
CITES — Vicuña conservation and sustainable use
March 8 — International Women’s Day
United Nations — International Women’s Day
UN Women — International Women’s Day
Smithsonian National Museum of American History — “We Can Do It!” Poster
March 21 — International Day of Forests
United Nations — International Day of Forests
FAO — International Day of Forests
March 21 — World Day for Glaciers
UNESCO — World Day for Glaciers
United Nations — Resolution 77/158: International Year of Glaciers’ Preservation, 2025
March 21 — International Day for the Elimination of Racial Discrimination
United Nations — International Day for the Elimination of Racial Discrimination
United Nations — Remembering the Sharpeville Massacre
March 21 — World Down Syndrome Day
United Nations — World Down Syndrome Day
Down Syndrome International — World Down Syndrome Day
March 22 — World Water Day
United Nations — World Water Day
WHO / UNICEF Joint Monitoring Programme — Drinking Water
March 23 — World Meteorological Day
World Meteorological Organization — World Meteorological Day
World Meteorological Organization — Early Warnings for All
March 30 — International Day of Zero Waste
United Nations — International Day of Zero Waste
April
April 4 — International Day for Mine Awareness and Assistance in Mine Action
United Nations — International Day for Mine Awareness and Assistance in Mine Action
Landmine and Cluster Munition Monitor — Landmine Monitor 2025
April 5 — International Day of Conscience
United Nations — International Day of Conscience
United Nations — Universal Declaration of Human Rights, Article 1
April 6 — International Day of Sport for Development and Peace
United Nations — International Day of Sport for Development and Peace
International Olympic Committee — Athens 1896
United Nations — International Day of Sport for Development and Peace
International Olympic Committee — Paris 2024 Olympic Games
April 7 — World Health Day
World Health Organization — History of Smallpox Vaccination
World Health Organization — WHO History
April 12 — International Day of Human Space Flight
United Nations — International Day of Human Space Flight
NASA — Yuri Gagarin: First Human in Space
April 21 — World Creativity and Innovation Day
United Nations — World Creativity and Innovation Day
United Nations Digital Library — Resolution 71/284
April 22 — International Mother Earth Day
United Nations — International Mother Earth Day resolution and sponsors
Plurinational State of Bolivia — Law No. 071, Rights of Mother Earth (2010)
Bolivia — Ley N° 071, Derechos de la Madre Tierra
April 23, 2026 — International Girls in ICT Day
4th Thursday of April — International Girls in ICT Day
International Telecommunication Union — About International Girls in ICT Day
University of Pennsylvania — 75th Anniversary of ENIAC
Smithsonian American Women's History Museum — Human Computer Project
April 23 — World Book and Copyright Day
UNESCO — World Book and Copyright Day
April 24 — International Day of Multilateralism and Diplomacy for Peace
United Nations — International Day of Multilateralism and Diplomacy for Peace
April 25 — World Malaria Day
WHO — Africa Malaria Day and the Abuja Summit
United Nations — World Malaria Day
April 30 — International Jazz Day
UNESCO — International Jazz Day
Smithsonian National Museum of American History — What is Jazz?
May
May 2 — World Tuna Day
United Nations — General Assembly declares May 2 World Tuna Day
United Nations — Resolution 71/124: World Tuna Day
NOAA Fisheries — Atlantic Bluefin Tuna
May 3 — World Press Freedom Day
UNESCO — World Press Freedom Day
United Nations — World Press Freedom Day
UNESCO — Safety of Journalists
Day of Vesak
United Nations in Sri Lanka — Day of Vesak
United Nations Digital Library — Resolution 54/115: International recognition of the Day of Vesak
May 8–9 — Time of Remembrance and Reconciliation for Those Who Lost Their Lives During the Second World War
United Nations — History of the United Nations
United Nations — Charter of the United Nations
May 12 — International Day of Plant Health
Food and Agriculture Organization of the United Nations — International Day of Plant Health
International Plant Protection Convention — International Day of Plant Health
Food and Agriculture Organization of the United Nations — International Day of Plant Health
International Plant Protection Convention — International Day of Plant Health
May 15 — International Day of Families
United Nations — International Day of Families
May 16 — International Day of Light
UNESCO — International Day of Light
UNESCO — General Conference proclaims 16 May International Day of Light
May 20 — World Bee Day
United Nations — World Bee Day: Background
FAO — Pollinators and food production
FAO — Global Action on Pollination Services for Sustainable Agriculture
May 21 — International Tea Day
FAO — Resolution 12/2019: International Tea Day
Government of India — International Tea Day
May 25 — World Football Day
United Nations — World Football Day
United Nations — General Assembly, World Football Day
UN Digital Library — Resolution establishing World Football Day
The Football Association — History of The FA
May 30 — International Day of Potato
United Nations — International Day of Potato
FAO — International Day of Potato
FAO — International Day of Potato established following Peru-led initiative
June
June 1 — Global Day of Parents
United Nations — Global Day of Parents
United Nations General Assembly — Resolution A/RES/66/292
June 3 — World Bicycle Day
United Nations — World Bicycle Day
United Nations — General Assembly establishes World Bicycle Day
Smithsonian Institution — Draisienne
June 5 — World Environment Day
United Nations — World Environment Day: Background
United Nations — United Nations Conference on the Human Environment, Stockholm 1972
United Nations Environment Programme — About UNEP
June 8 — World Ocean Day
United Nations — World Oceans Day: Background
Government of Canada — World Oceans Day
NOAA Ocean Exploration — How much of the ocean has been explored?
June 10 — International Day for Dialogue among Civilizations
United Nations — International Day for Dialogue among Civilizations
United Nations — Resolution A/RES/78/286
United Nations — General Assembly adoption
June 11 — International Day of Play
United Nations — International Day of Play
United Nations — Resolution A/RES/78/268
UN Digital Library — International Day of Play resolution
UNICEF — International Day of Play
The Metropolitan Museum of Art — Ancient Egyptian Board Games
June 14 — World Blood Donor Day
World Health Organization — World Blood Donor Day
World Health Organization — Blood safety and availability
Nobel Prize — Karl Landsteiner
June 17 — World Day to Combat Desertification and Drought
United Nations — World Day to Combat Desertification and Drought
UN Convention to Combat Desertification — Desertification & Drought Day
UN Convention to Combat Desertification — Land and Life
June 18 — Sustainable Gastronomy Day
United Nations — Sustainable Gastronomy Day
Food and Agriculture Organization — Sustainable Gastronomy Day
UNEP — Food Waste Index Report
June 27 — International Day of Deafblindness
United Nations — International Day of Deafblindness
World Federation of the Deafblind
Helen Keller — American Foundation for the Blind
June 30 — International Asteroid Day
July
July 6 — World Rural Development Day
United Nations — World Rural Development Day
United Nations — Resolution A/RES/78/326
July 11 — World Population Day
United Nations — World Population Day: Background
July 11 — World Horse Day
United Nations — World Horse Day
United Nations General Assembly — Resolution A/RES/79/291
Food and Agriculture Organization of the United Nations — Horses and working animals
July 12 — International Day of Combating Sand and Dust Storms
United Nations — International Day of Combating Sand and Dust Storms
United Nations — Resolution A/RES/77/294
United Nations Convention to Combat Desertification — Sand and Dust Storms
July 12 — International Day of Hope
United Nations — International Day of Hope
United Nations — General Assembly adopts International Day of Hope
United Nations — Resolution A/RES/79/270
July 18 — Nelson Mandela International Day
United Nations — Nelson Mandela International Day
United Nations — Resolution A/RES/64/13
Nelson Mandela Foundation — Mandela Day
July 20 — World Chess Day
United Nations — World Chess Day
United Nations — Resolution A/RES/74/22
July 20 — International Moon Day
United Nations — International Moon Day
United Nations — Resolution A/RES/76/76
Moon Village Association — International Moon Day
United Nations — World Drowning Prevention Day
United Nations — Resolution A/RES/75/273: Global Drowning Prevention
United Nations — Bangladesh and Ireland draft resolution
World Health Organization — World Drowning Prevention Day 2026
JULY 30 — WORLD DAY AGAINST TRAFFICKING IN PERSONS
United Nations — World Day against Trafficking in Persons
July 30 — International Day of Friendship
United Nations — International Day of Friendship
United Nations — Resolution A/RES/65/275
United Nations — Letter from Paraguay, 2010
Royal Society — The anatomy of friendship
AUGUST 6 — INTERNATIONAL DAY OF AWARENESS OF THE SPECIAL DEVELOPMENT NEEDS AND CHALLENGES OF LANDLOCKED DEVELOPING COUNTRIES
United Nations General Assembly — Resolution A/RES/79/320
AUGUST 9 — INTERNATIONAL DAY OF THE WORLD’S INDIGENOUS PEOPLES
United Nations — International Day of the World’s Indigenous Peoples
AUGUST 11 — WORLD STEELPAN DAY
United Nations — World Steelpan Day
AUGUST 12 — INTERNATIONAL YOUTH DAY
United Nations — International Youth Day
United Nations — International Youth Day: Background
United Nations — Resolution A/RES/54/120
AUGUST 19 — WORLD HUMANITARIAN DAY
United Nations — World Humanitarian Day
United Nations General Assembly — Resolution A/RES/63/139