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 South Australian Railways U class, 2-6-0 steam locomotives WAGR U class, 4-6-2 steam locomotives WAGR U class (1903), 0-6-0 tank locomotive Class U special wagon, railway goods wagons U-class Melbourne tram
See also UCLASS SR U1 class U and non-U English