U-148 may refer to one of the following German submarines:
- SM U-148, a Type U 142 submarine launched during the First World War but unfinished at the end of the war; broken up incomplete 1919–20
- During the First World War, Germany also had this submarine with a similar name:
- SM UB-148, a Type UB III submarine launched in 1918; surrendered to the United States; sunk as a target
- During the First World War, Germany also had this submarine with a similar name:
- German submarine U-148 (1940), a Type IID submarine that served in the Second World War until scuttled on 2 May 1945; wreck broken up at later date
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.