U-48 may refer to one of the following German submarines:
- SM U-48, a Type U 43 submarine launched in 1915 and that served in the First World War until scuttled on 24 November 1917
- During the First World War, Germany also had these submarines with similar names:
- SM UB-48, a Type UB III submarine launched in 1917 and scuttled on 28 October 1918
- SM UC-48, a Type UC II submarine launched in 1916 and interned in Spain on 23 March 1918
- During the First World War, Germany also had these submarines with similar names:
- German submarine U-48 (1939), a Type VIIB submarine that served in the Second World War until scuttled on 3 May 1945
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.