U class

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