U-154 may refer to one of the following German submarines:
- SM U-154, a Type U 151 submarine launched in 1917 and that served in World War I until sunk on 11 May 1918
- During the First World War, Germany also had this submarine with a similar name:
- SM UB-154, a Type UB III submarine laid down in 1917
- During the First World War, Germany also had this submarine with a similar name:
- German submarine U-154 (1941), a Type IXC submarine that served in World War II until sunk on 3 July 1944
This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.