U class or Class U may refer to:
- British U-class submarine, submarines built just before and during World War II
- U-class destroyer, destroyers of the Royal Navy launched in 1942–1943
- SR U class, 2-6-0 steam locomotives built for the Southern Railway
- GNRI Class U, 4-4-0 steam locomotives built for the Great Northern Railway, Ireland
- NER Class U, 0-6-2 steam locomotives built for the North Eastern Railway
- NZR U class, 4-6-0 steam locomotives built for New Zealand Railways
- Russian locomotive class U, 4-6-0 steam locomotives
- South African Class U 2-6-2+2-6-2, steam locomotives
- Class U special wagon, railway goods wagons
- U-class Melbourne tram
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