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- Ukrainian national revivalSocial and political movement in Ukraine
- Undeclared warType of military conflict
- UnigenitusPapal bull regarding Jansenism
- Union of Lublin1569 union of Poland and Lithuania
- Union of the CrownsPersonal union of the kingdoms of Scotland, England, and Ireland from 1603
- United ColoniesName used for the Thirteen Colonies
- United Kingdom Internal Market Act 2020UK law relating to internal trade
- United Kingdom invocation of Article 50 of the Treaty on European UnionInvocation of the EU's withdrawal process for "Brexit"
- United Reformed ChurchChristian church organisation in the United Kingdom
- Uppsala SynodThe Uppsala Synod in 1593 was the most important synod of the Lutheran Church of Sweden. S
- UrsulinesReligious institutes of the Catholic Church
- USS Trumbull (1776)The second Trumbull was a three-masted, wooden-hulled sailing frigate and was one of the f
- Uzbek Khanate1428–1471 Shaybanid state preceding the Khanate of Bukhara