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- World Radio Day (12 February)
- World Refugee Day (20 June)
- World Seagrass Day (1 March)
- World Science Day for Peace and Development (10 November)
- World Soil Day (5 December)
- World Space Week (4-10 October)
- World Statistics Day (20 October)
- World Summit (2005)
- World Sustainable Transport Day (26 November)
- World Teachers’ Day (5 October)
- World Telecommunication and Information Society Day (17 May)
- World Television Day (21 November)
- World Toilet Day (19 November)
- World Tourism Day (27 September)
- World Tourism Organization (UNWTO)
- World Trade Organization (WTO)
- World Tsunami Awareness Day (5 November)
- World Tuberculosis Day [WHO] (24 March)
- World Tuna Day (2 May)
- World Water Day (22 March)
- World Wildlife Day (3 March)
- World Youth Skills Day (15 July)
Y
- Yearbook of the United Nations
- Youth (Department of Economic and Social Affairs)
- Youth (Global Issue)
- Yugoslavia, International Criminal Tribunal for the former (ICTY)
Z
- Zero Discrimination Day (1 March)