U-137 may refer to one of the following German submarines:
, a Type U 127 submarine launched in 1916 and that served in the First World War During the First World War, Germany also had this submarine with a similar name: , a Type UB III submarine laid down but unfinished at the end of the war; broken up on the slip in 1919 , a Type IID submarine that served in the Second World War until scuttled on 2 May 1945
U137 may also refer to: U137, the designation of the Soviet that ran aground on 27 October 1981 just outside Karlskrona, Sweden