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- UgariticExtinct Northwest Semitic language
- Ugaritic alphabetCuneiform consonantal alphabet of 30 letters
- Ukrainian languageEast Slavic language
- Unclassified languageLanguage whose genetic affiliation has not been established
- Unified English BrailleBraille standard for the English language
- Universal Character Set charactersComplete list of the characters available on most computers
- Uralic languagesLanguage family of northern Eurasia
- Urartian languageLanguage of the ancient Urartu, now the Eastern Anatolia region
- UrduIndo-Aryan language
- UsilampattiUsilampatti (Tamil: ) is a town and a second grade municipality of Madurai district in the
- Uto-Aztecan languagesNorth American language family
- Uzbek languageKarluk Turkic language

