Encyclopedias, Almanacs, Transcripts, and Maps
- Uezd
- Ugra River, Battle of
- Ukaz
- Ulbricht, Walter (1893–1973)
- Ulm, Battle of
- Ulrichs, Karl Heinrich
- Umayyad Empire
- Umberto I
- Umberto Nobile
- Unadilla, New York
- Uncle Tom's Cabin
- Underwood Tariff Act
- Unforeseen Consequences
- Unicorns
- Unification of The Armed Services
- Uniforms
- Uniforms of the Revolution
- Union Federations Split Along Ideological Lines
- Union Label Movement
- Union League of America