German submarine U-74

U-74 may refer to one of the following German submarines:


 * SMU U-74, a Type UE I submarine launched in 1915 and that served in World War I until sunk 17 May 1916
 * During World War I, Germany also had these submarines with similar names:
 * SMU UB-74, a Type UB III submarine launched in 1917 and sunk on 26 May 1918
 * SMU UC-74, a Type UC II submarine launched in 1916 and interned at Barcelona on 21 November 1918; surrendered on 26 March 1919; broken up at Toulon in July 1921
 * GS U-74 (1940), a Type VIIB submarine that served in World War II until sunk on 2 May 1942