German submarine U-22

U-22 may refer to one of the following German submarines:


 * SMU U-22 (Germany), was a Type U 19 submarine launched in 1913 and that served in the First World War until surrendered on 1 December 1918
 * During the First World War, Germany also had these submarines with similar names:
 * SMU UB-22, a Type UB II submarine launched in 1915 and sunk 19 January 1918
 * SMU UC-22, a Type UC II submarine launched in 1916 and surrendered on 3 February 1919
 * GS U-22 (1936), a Type IIB submarine that served in the Second World War and went missing 27 March 1940
 * GS U-22 (S171), a Type 206 submarine of the Bundesmarine that was launched in 1974 and still in service

U-22 or U-XXII may also refer to:
 * SMU U-22 (Austria-Hungary), a U-20 class submarine of the Austro-Hungarian Navy