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- Ubi periculumUbi periculum is a papal bull promulgated by Pope Gregory X during the Second Council of L
- Ulaanzuukh cultureBronze Age archaeological culture in eastern Mongolia
- Umayyad CaliphateSecond Islamic caliphate (661–750)
- Umayyad campaigns in IndiaMilitary campaigns of the Arab Umayyad Caliphate in India
- Umayyad state of CórdobaState in Islamic Iberia (756–1031 CE)
- Unified SillaKorean kingdom (668–935)
- United Nations–administered CambodiaUN-administered territory from 1992 to 1993
- United States of Indonesia1949–1950 federal state in Southeast Asia
- United States recognition of Jerusalem as capital of IsraelOn December 6, 2017, the United States officially recognized Jerusalem as the capital city
- Upper AlsaceHistorical region of France
- Uprising of Asen and Peter1185 uprising against Byzantine rule in the eastern Balkans
- UrdujaUrduja was a legendary warrior princess recorded in the travel accounts of Ibn Battuta (13
- Uyghur Khaganate744–840 Turkic empire in East Asia
- Uyghur languageKarluk Turkic language