U-22 may refer to one of the following German submarines:
- SM 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:
- SM UB-22, a Type UB II submarine launched in 1915 and sunk 19 January 1918
- SM UC-22, a Type UC II submarine launched in 1916 and surrendered on 3 February 1919
- During the First World War, Germany also had these submarines with similar names:
- German submarine U-22 (1936), a Type IIB submarine that served in the Second World War and went missing 27 March 1940
- German submarine U-22 (S171), a Type 206 submarine of the Bundesmarine that was launched in 1974 and still in service
This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.