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U
| Language name | Native name | Code |
|---|---|---|
| Udmurt | Удмурт Кыл | UDM |
| Ugaritic | - | UGA |
| Uighur; Uyghur | Uyƣurqə, Uyğurçe, ئۇيغۇرچ | UIG |
| Ukrainian | Українська Мова | UKR |
| Umbundu | Úmbúndú | UMB |
| Uncoded languages | - | MIS |
| Undetermined | - | UND |
| Upper Sorbian | Hornjoserbsce | HSB |
| Urdu | اردو | URD |
| Uzbek | O'zbek, Ўзбек, أۇزبېك | UZB |