| Date | Day | International Day | CW |
|---|---|---|---|
| January 2004 | |||
| 04.01.2004 | Su | World Braille Day | 01 |
| 24.01.2004 | Sa | International Day of Education | 04 |
| 27.01.2004 | Tu | International Day of Commemoration in Memory of the Victims of the Holocaust | 05 |
| February 2004 | |||
| 02.02.2004 | Mo | World Wetlands Day | 06 |
| 06.02.2004 | Fr | International Day of Zero Tolerance for Female Genital Mutilation | 06 |
| 11.02.2004 | We | International Day of Women and Girls in Science | 07 |
| 21.02.2004 | Sa | International Mother Language Day | 08 |
| March 2004 | |||
| 03.03.2004 | We | World Wildlife Day | 10 |
| 05.03.2004 | Fr | World Day of Prayer | 10 |
| 08.03.2004 | Mo | International Women's Day | 11 |
| 20.03.2004 | Sa | International Day of Happiness | 12 |
| 21.03.2004 | Su | International Day for the Elimination of Racial Discrimination | 12 |
| 21.03.2004 | Su | World Poetry Day | 12 |
| 21.03.2004 | Su | World Down Syndrome Day | 12 |
| 22.03.2004 | Mo | World Water Day | 13 |
| 23.03.2004 | Tu | World Meteorological Day | 13 |
| 24.03.2004 | We | World Tuberculosis Day | 13 |
| 25.03.2004 | Th | International Day of Remembrance of the Victims of Slavery and the Transatlantic Slave Trade | 13 |
| 26.03.2004 | Fr | Purple Day for Epilepsy | 13 |
| April 2004 | |||
| 02.04.2004 | Fr | World Autism Awareness Day | 14 |
| 04.04.2004 | Su | International Day for Mine Awareness and Support for Mine Action Programmes | 14 |
| 07.04.2004 | We | World Health Day | 15 |
| 08.04.2004 | Th | International Romani Day | 15 |
| 22.04.2004 | Th | Earth Day | 17 |
| 23.04.2004 | Fr | World Book and Copyright Day | 17 |
| 26.04.2004 | Mo | World Intellectual Property Day | 18 |
| May 2004 | |||
| 03.05.2004 | Mo | World Press Freedom Day | 19 |
| 05.05.2004 | We | Europe Day of the Council of Europe (CoE) | 19 |
| 08.05.2004 | Sa | Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War | 19 |
| 08.05.2004 | Sa | World Red Cross Day | 19 |
| 09.05.2004 | Su | Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War | 19 |
| 09.05.2004 | Su | Europe Day of the European Union (EU) | 19 |
| 12.05.2004 | We | International Nurses Day | 20 |
| 15.05.2004 | Sa | International Day of Families | 20 |
| 17.05.2004 | Mo | World Telecommunication and Information Society Day | 21 |
| 21.05.2004 | Fr | World Day for Cultural Diversity for Dialogue and Development | 21 |
| 22.05.2004 | Sa | International Day for Biological Diversity | 21 |
| 25.05.2004 | Tu | Week of Solidarity with the Peoples of All Colonial Territories Fighting for Freedom, Independence, and Human Rights (25.05. - 31.05.) | 22 |
| 29.05.2004 | Sa | Day of United Nations Peacekeepers | 22 |
| 31.05.2004 | Mo | World No-Tobacco Day | 23 |
| June 2004 | |||
| 04.06.2004 | Fr | International Day of Innocent Children Victims of Aggression | 23 |
| 05.06.2004 | Sa | World Environment Day | 23 |
| 14.06.2004 | Mo | World Blood Donor Day | 25 |
| 17.06.2004 | Th | World Day to Combat Desertification and Drought | 25 |
| 20.06.2004 | Su | World Refugee Day | 25 |
| 21.06.2004 | Mo | International Day of Yoga | 26 |
| 23.06.2004 | We | United Nations Public Service Day | 26 |
| 26.06.2004 | Sa | United Nations International Day in Support of Victims of Torture | 26 |
| 26.06.2004 | Sa | United Nations International Day in Support of Victims of Torture | 26 |
| July 2004 | |||
| 03.07.2004 | Sa | International Day of Cooperatives | 27 |
| 11.07.2004 | Su | World Population Day | 28 |
| 30.07.2004 | Fr | International Day of Friendship | 31 |
| August 2004 | |||
| 09.08.2004 | Mo | International Day of the World's Indigenous People | 33 |
| 12.08.2004 | Th | International Youth Day | 33 |
| 23.08.2004 | Mo | International Day for the Remembrance of the Slave Trade and Its Abolition | 35 |
| September 2004 | |||
| 08.09.2004 | We | International Literacy Day | 37 |
| 15.09.2004 | We | International Day of Democracy | 38 |
| 16.09.2004 | Th | International Day for the Preservation of the Ozone Layer | 38 |
| 20.09.2004 | Mo | Universal Children’s Day (AT, DE) | 39 |
| 21.09.2004 | Tu | International Day of Peace | 39 |
| 21.09.2004 | Tu | World Alzheimer's Day | 39 |
| 23.09.2004 | Th | International Day of Sign Languages | 39 |
| 25.09.2004 | Sa | Day of deaf people | 39 |
| 27.09.2004 | Mo | World Tourism Day | 40 |
| 30.09.2004 | Th | World Maritime Day | 40 |
| October 2004 | |||
| 01.10.2004 | Fr | International Day of Older Persons | 40 |
| 02.10.2004 | Sa | International Day of Non-Violence | 40 |
| 04.10.2004 | Mo | World Space Week (04.10.-10.10.) | 41 |
| 04.10.2004 | Mo | World Habitat Day | 41 |
| 05.10.2004 | Tu | World Teachers’ Day | 41 |
| 09.10.2004 | Sa | World Post Day | 41 |
| 10.10.2004 | Su | World Mental Health Day | 41 |
| 15.10.2004 | Fr | International Day of Rural Women | 42 |
| 16.10.2004 | Sa | World Food Day | 42 |
| 17.10.2004 | Su | International Day for the Eradication of Poverty | 42 |
| 24.10.2004 | Su | United Nations Day | 43 |
| 24.10.2004 | Su | World Development Information Day | 43 |
| 24.10.2004 | Su | Disarmament Week (24.10. - 30.10.) | 43 |
| 27.10.2004 | We | World Day for Audiovisual Heritage | 44 |
| November 2004 | |||
| 06.11.2004 | Sa | International Day for Preventing the Exploitation of the Environment in War and Armed Conflict | 45 |
| 14.11.2004 | Su | World Diabetes Day | 46 |
| 16.11.2004 | Tu | World Day of Remembrance for Road Traffic Victims | 47 |
| 19.11.2004 | Fr | International Men's Day | 47 |
| 20.11.2004 | Sa | World Day of Remembrance for Road Traffic Victims | 47 |
| 20.11.2004 | Sa | Universal Children's Day | 47 |
| 21.11.2004 | Su | World Television Day | 47 |
| 25.11.2004 | Th | International Day for the Elimination of Violence against Women | 48 |
| 29.11.2004 | Mo | International Day of Solidarity with the Palestinian People | 49 |
| December 2004 | |||
| 01.12.2004 | We | World AIDS Day | 49 |
| 02.12.2004 | Th | International Day for the Abolition of Slavery | 49 |
| 03.12.2004 | Fr | International Day of Persons with Disabilities | 49 |
| 05.12.2004 | Su | International Volunteer Day for Economic and Social Development | 49 |
| 07.12.2004 | Tu | International Civil Aviation Day | 50 |
| 09.12.2004 | Th | International Anti-Corruption Day | 50 |
| 10.12.2004 | Fr | Human Rights Day | 50 |
| 11.12.2004 | Sa | International Mountain Day | 50 |
| 18.12.2004 | Sa | International Migrants Day | 51 |
| 20.12.2004 | Mo | International Human Solidarity Day | 52 |
Errors excepted. No guarantee for the correctness of the data.
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