German submarine U-77

U-77 may refer to one of the following German submarines:

, a Type UE I submarine launched in 1916 and that served in World War I until sunk 7 July 1916 During World War I, Germany also had these submarines with similar names: , a Type UB III submarine launched in 1917 and surrendered on 16 January 1919; broken up at Swansea in 1922 , a Type UC II submarine launched in 1916 and sunk on 14 July 1918 , a Type VIIC submarine that served in World War II until sunk on 28 March 1943