U-8 may refer to one of the following German submarines: , a Type U 5 submarine launched in 1911 and that served in the First World War until sunk on 4 March 1915 During the First World War, Germany also had these submarines with similar names: , a Type UB I submarine launched in 1915; transferred to Bulgaria on 25 March 1916; surrendered on 25 February 1919; broken up at Bizerte in August 1921 , a Type UC I submarine launched in 1915 and grounded on 4 November 1915 , a Type IIB submarine that served in the Second World War and was scuttled on 2 May 1945 , a Type 205 submarine of the Bundesmarine that was launched in 1964 and scrapped in 1974 Submarines of Germany