Definities van Historische gids van de 20e eeuw in de Ensie U
- U-2-incident (1 mei 1960)
- U-boot
- Übermensch
- Uganda
- Ujamaa-socialisme
- Ulbricht, Ernst Paul Walter (1893-1973)
- Ulster (Noord-Ierland)
- Ultra's
- UMHK
- Unabhängige Sozialdemokratische Partei Deutschlands (USPD)
- UNCRO
- UNCTAD
- UNDRO
- UNESCO
- Uniao Naçional para a Independéncia Total de Angola (UNITA)
- UNICEF
- Unie van Socialistische Sovjet Republieken (USSR)
- UNIFIL
- Union Minière du Haut Katanga (UMHK)
- UNITA
- UNITAF
- United Fruit Company
- United Nations Conference on Trade and Development (UNCTAD)
- United Nations Confidence Restoration Operation in Croatia (UNCRO)
- United Nations Disaster and Relief Organization (UNDRO)
- United Nations Educational, Scientific and Cultural Organization (UNESCO)
- United Nations Interim Forces in Lebanon (UNIFIL)
- United Nations International Children Emergency Fund (UNICEF)
- United Nations Operation in Somalia (UNOSOM II)
- United Nations Protection Force (UNPROFOR)
- United Task Force (UNITAF)
- Universele Verklaring van de Rechten van de Mens (UVRM) (10 december 1948)
- UNOSOM II
- UNPROFOR
- Untermensch
- Untung, Achmed Pribadi
- Uruguay-ronde (1986-92)
- USPD
- USSR
- Ustasa-beweging
- UVRM
