- 01 January 2025 – World Day of Peace
- 04 January 2025 – World Braille Day
- 14 January 2025 – World Logic Day
- 24 January 2025 – International Day of Education
- 27 January 2025 – International Day of Commemoration in Memory of the Victims of the Holocaust
- 04 February 2025 – World Cancer Day
- 06 February 2025 – International Day of Zero Tolerance for Female Genital Mutilation
- 11 February 2025 – International Day of Women and Girls in Science
- 13 February 2025 – World Radio Day
- 20 February 2025 – World Day of Social Justice
- 21 February 2025 – International Mother Language Day
- 01 March 2025 – Zero Discrimination Day
- 03 March 2025 – World Wildlife Day
- 08 March 2025 – International Women’s Day
- 20 March 2025 – International Day of Happiness
- 21 March 2025 – International Day for the Elimination of Racial Discrimination
- 21 March 2025 – World Poetry Day
- 21 March 2025 – International Day of Nowruz
- 21 March 2025 – International Day of Forests
- 22 March 2025 – World Water Day
- 23 March 2025 – World Meteorological Day
- 24 March 2025 – World Tuberculosis Day
- 02 April 2025 – World Autism Awareness Day
- 04 April 2025 – International Day for Mine Awareness and Assistance in Mine Action
- 05 April 2025 – International Day of Conscience
- 06 April 2025 – International Day of Sport for Development and Peace
- 07 April 2025 – World Health Day
- 12 April 2025 – International Day of Human Space Flight
- 14 April 2025 – World Chagas Disease Day
- 20 April 2025 – Chinese Language Day
- 22 April 2025 – International Mother Earth Day
- 23 April 2025 – World Book and Copyright Day
- 23 April 2025 – English Language Day
- 25 April 2025 – World Malaria Day
- 26 April 2025 – World Intellectual Property Day
- 28 April 2025 – World Day for Safety and Health at Work
- 30 April 2025 – International Jazz Day
- 03 May 2025 – World Press Freedom Day
- 05 May 2025 – World Portuguese Language Day
- 05 May 2025 – International Day of the Midwife
- 08 May 2025 – Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War
- 09 May 2025 – Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War (continued)
- 15 May 2025 – International Day of Families
- 16 May 2025 – International Day of Living Together in Peace
- 16 May 2025 – International Day of Light
- 17 May 2025 – World Telecommunication and Information Society Day
- 20 May 2025 – World Bee Day
- 21 May 2025 – World Day for Cultural Diversity for Dialogue and Development
- 22 May 2025 – International Day for Biological Diversity
- 29 May 2025 – International Day of UN Peacekeepers
- 31 May 2025 – World No-Tobacco Day
- 01 June 2025 – Global Day of Parents
- 04 June 2025 – International Day of Innocent Children Victims of Aggression
- 05 June 2025 – World Environment Day
- 06 June 2025 – Russian Language Day
- 08 June 2025 – World Oceans Day
- 12 June 2025 – World Day Against Child Labour
- 13 June 2025 – International Albinism Awareness Day
- 14 June 2025 – World Blood Donor Day
- 15 June 2025 – World Elder Abuse Awareness Day
- 16 June 2025 – International Day of Family Remittances
- 17 June 2025 – World Day to Combat Desertification and Drought
- 18 June 2025 – Sustainable Gastronomy Day
- 19 June 2025 – International Day for the Elimination of Sexual Violence in Conflict
- 20 June 2025 – World Refugee Day
- 21 June 2025 – International Day of Yoga
- 23 June 2025 – United Nations Public Service Day
- 23 June 2025 – International Widows’ Day
- 25 June 2025 – Day of the Seafarer
- 26 June 2025 – International Day Against Drug Abuse and Illicit Trafficking
- 26 June 2025 – International Day in Support of Victims of Torture
- 30 June 2025 – International Asteroid Day
- 01 July 2025 – International Joke Day
- 11 July 2025 – World Population Day
- 15 July 2025 – World Youth Skills Day
- 18 July 2025 – Nelson Mandela International Day
- 28 July 2025 – World Hepatitis Day
- 30 July 2025 – International Day of Friendship
- 30 July 2025 – World Day Against Trafficking in Persons
- 06 August 2025 – Hiroshima Peace Memorial Day
- 09 August 2025 – International Day of the World’s Indigenous Peoples
- 12 August 2025 – International Youth Day
- 19 August 2025 – World Humanitarian Day
- 21 August 2025 – International Day of Remembrance and Tribute to the Victims of Terrorism
- 22 August 2025 – International Day Commemorating the Victims of Acts of Violence Based on Religion or Belief
- 23 August 2025 – International Day for the Remembrance of the Slave Trade and Its Abolition
- 29 August 2025 – International Day Against Nuclear Tests
- 30 August 2025 – International Day of the Victims of Enforced Disappearances
- 05 September 2025 – International Day of Charity
- 08 September 2025 – International Literacy Day
- 09 September 2025 – International Fetal Alcohol Spectrum Disorders Awareness Day
- 15 September 2025 – International Day of Democracy
- 16 September 2025 – International Day for the Preservation of the Ozone Layer
- 21 September 2025 – International Day of Peace
- 23 September 2025 – International Day of Sign Languages
- 26 September 2025 – International Day for the Total Elimination of Nuclear Weapons
- 27 September 2025 – World Tourism Day
- 28 September 2025 – International Day for Universal Access to Information
- 29 September 2025 – World Heart Day
- 30 September 2025 – International Translation Day
- 01 October 2025 – International Day of Older Persons
- 02 October 2025 – International Day of Non-Violence
- 05 October 2025 – World Teachers’ Day
- 10 October 2025 – World Mental Health Day
- 11 October 2025 – International Day of the Girl Child
- 13 October 2025 – International Day for Disaster Risk Reduction
- 15 October 2025 – International Day of Rural Women
- 16 October 2025 – World Food Day
- 17 October 2025 – International Day for the Eradication of Poverty
- 20 October 2025 – World Statistics Day (celebrated every five years, next in 2025)
- 24 October 2025 – United Nations Day
- 24 October 2025 – World Development Information Day
- 27 October 2025 – World Day for Audiovisual Heritage
- 31 October 2025 – World Cities Day
- 02 November 2025 – International Day to End Impunity for Crimes against Journalists
- 05 November 2025 – World Tsunami Awareness Day
- 10 November 2025 – World Science Day for Peace and Development
- 14 November 2025 – World Diabetes Day
- 16 November 2025 – International Day for Tolerance
- 19 November 2025 – World Toilet Day
- 20 November 2025 – World Children’s Day
- 21 November 2025 – World Television Day
- 25 November 2025 – International Day for the Elimination of Violence Against Women
- 29 November 2025 – International Day of Solidarity with the Palestinian People
- 01 December 2025 – World AIDS Day
- 02 December 2025 – International Day for the Abolition of Slavery
- 03 December 2025 – International Day of Persons with Disabilities
- 05 December 2025 – International Volunteer Day for Economic and Social Development
- 05 December 2025 – World Soil Day
- 07 December 2025 – International Civil Aviation Day
- 09 December 2025 – International Day of Commemoration and Dignity of the Victims of the Crime of Genocide
- 09 December 2025 – International Anti-Corruption Day
- 10 December 2025 – Human Rights Day
- 11 December 2025 – International Mountain Day
- 18 December 2025 – International Migrants Day
- 18 December 2025 – Arabic Language Day
- 20 December 2025 – International Human Solidarity Day