DAYS
January
1 - Global Family Day
27 - International Holocaust Remembrance Day
February
20 - World Day of Social Justice
21 - International Mother Language Day
March
8 - International Women's Day
21 - International Day for the Elimination of Racial Discrimination World Poetry Day(UNESCO)
22 - World Day for Water
23 - World Meteorological Day
24 - World Tuberculosis Day (WHO)
International Day of Remembrance of the Victims of Slavery and the
Transatlantic Slave Trade
April
2 - World Autism Awareness Day
4 - International Day for Mine Awareness and Assistance in Mine Action
7 - World Health Day
   - International Day of Reflection on the Genocide in Rwanda
12 - International Day of Human Space Flight
17 - World Hemophilia Day
22 - Earth Day (Not an official UN event but the Secretary-General rings the Peace Bell in front of the Secretariat Building.)
23 - World Book and Copyright Day
24 - World Day for Laboratory Animals
25 - World Malaria Day(WHO)
26 - World Intellectual Property Day (WIPO)
May
3 - World Press Freedom Day
8- 9 - Remembrance of the dead of World War II
5 - International Day of Families
17 - World Information Society Day
21 - Day for Cultural Diversity for Dialogue and Development
22 - International Day for Biological Diversity
29 - International Day of UN Peacekeepers
31 - World No Tobacco Day
June
4 - International Day of Innocent Children Victims of Aggression
5 - World Environment Day (UNEP)
14 - World Blood Donor Day
17 - World Day to Combat Desertification and Drought
19 - World Sickle Cell Day
20 - World Refugee Day
23 - United Nations Public Service Day
26 - International Day against Drug Abuse and Illicit Trafficking
     - International Day in Support of Victims of Torture
July
First Saturday of July - International Day of Cooperatives
11 - World Population Day
18 - Mandela Day, to be observed by volunteer public service.
August
9 - International Day of the World's Indigenous People
12 - International Youth Day
23 - International Day for the Remembrance of the Slave Trade and its Abolition
September
8 - International Literacy Day
15 - International Day of Democracy
16 - International Day for the Preservation of the Ozone Layer
21 - International Day of Peace
October
First Monday of October - World Habitat Day
1 - International Day of Older Persons
2 - International Day of Non-Violence (Mahatma Gandhi's birthday)
Second Wednesday of October - International Day for Natural Disaster Reduction
9 - World Post Day
10 - World Mental Health Day
15 - International Day of Rural Women
16 - World Food Day(FAO)
17 - International Day for the Eradication of Poverty
24 - United Nations Day (UN Charter came into force on this date in 1945)
    - World Development Information Day
27 - World Day for Audiovisual Heritage (UNESCO)
November
Third Sunday of November - World Day of Remembrance for Road Traffic Victims
6 - International Day for Preventing the Exploitation of the Environment in War and Armed Conflict
14 - World Diabetes Day
16 - International Day for Tolerance
20 - Africa Industrialization Day
     - Universal Children's Day
21 - World Television Day
25 - International Day for the Elimination of Violence against Women
29 - International Day of Solidarity with the Palestinian People
December
1 - World Aids Day
2 - International Day for the Abolition of Slavery
3 - International Day of Persons with Disabilities
5 - International Volunteer Day for Economic and Social Development
7 - International Civil Aviation Day (ICAO)
9 - The International Day against Corruption
10 - Human Rights Day(anniversary of the General Assembly adoption of the Universal Declaration of Human Rights)
11 - International Mountain Day
18 - International Migrants Day
19 - United Nations Day for South-South Cooperation (ie: cooperation among the countries of Africa, Asia and Latin America/Caribbean)
20 - International Human Solidarity Day


WEEKS
March: Solidarity with the Peoples Struggling against Racism and Racial Discrimination (21–27)
May: Solidarity with the Peoples of Non-Self-Governing Territories(25–31)
October: World Space Week (4–10); Disarmament Week(24–30)


YEARS
2011 - International Year of Forests, International Year of Chemistry (UNESCO),


DECADES
1970s - First Development Decade
1976 - 1985 - United Nations Decade for Women
1980s - Second Development Decade
1990s - For Natural Disaster Reduction; For the Eradication of Colonialism; Third Development Decade
1994–2004 - First International Decade of the World's Indigenous People
1997–2006 - First United Nations Decade for the Eradication of Poverty
2000–2010 - Second International Decade for the Eradication of Colonialism
2000-2010 - Bone and Joint Decade (WHO)
2001–2010 - For a Culture of Peace and Non-violence for the Children of the World
2001-2010 - Decade to Roll Back Malaria (2001-2010)
2003–2012 - United Nations Literacy Decade
2005–2014 - United Nations Decade on Education for Sustainable Development
2005–2014 - Second International Decade of the World's Indigenous People
2005–2015 - Water for Life Decade
2011-2020 - United Nations Decade on Biodiversity