U-156 may refer to one of the following German submarines:
- SM U-156, a Type U 151 submarine launched in 1917; served in World War I until sunk on 25 September 1918
- German submarine U-156 (1941), a Type IXC submarine that served in World War II until sunk on 8 March 1943
|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.|
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