German submarine U-29

U-29 may refer to one of the following German submarines:


 * SMU U-29 (Germany), was a Type U 27 submarine launched in 1913 and that served in the First World War until sunk by HMS Dreadnought (1906) on 18 March 1915, the only submarine to be sunken by a battleship
 * During the First World War, Germany also had these submarines with similar names:
 * SMU UB-29, a Type UB II submarine launched in 1916 and sunk on 13 December 1916
 * SMU UC-29, a Type UC II submarine launched in 1916 and sunk on 7 June 1917
 * GS U-29 (1936), a Type VIIA submarine that served in the Second World War until scuttled on 4 May 1945
 * GS U-29 (S178), a Type 206 submarine of the Bundesmarine that was launched in 1974 and decommissioned in 2004

U-29 or U-XXIX may also refer to:
 * SMU U-29 (Austria-Hungary), a U-27 class submarine of the Austro-Hungarian Navy