U-29 may refer to one of the following German submarines:
, was a Type U 27 submarine launched in 1913 and that served in the First World War until sunk by 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: , a Type UB II submarine launched in 1916 and sunk on 13 December 1916 , a Type UC II submarine launched in 1916 and sunk on 7 June 1917 , a Type VIIA submarine that served in the Second World War until scuttled on 4 May 1945 , a Type 206 submarine of the Bundesmarine that was launched in 1974 and decommissioned in 2004