German submarine U-48

U-48 may refer to one of the following German submarines:


 * SMU 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:
 * SMU UB-48, a Type UB III submarine launched in 1917 and scuttled on 28 October 1918
 * SMU UC-48, a Type UC II submarine launched in 1916 and interned in Spain on 23 March 1918
 * GS U-48 (1939), a Type VIIB submarine that served in the Second World War until scuttled on 3 May 1945