| 释义 |
German submarine U-40 may refer to one of the following German submarines: - {{SMU|U-40|Germany}}, was a Type U 31 submarine launched in 1914 and that served in the First World War until sunk 23 June 1915
- During the First World War, Germany also had these submarines with similar names:
- {{SMU|UB-40}}, a Type UB II submarine launched in 1916 and scuttled on 5 October 1918
- {{SMU|UC-40}}, a Type UC II submarine launched in 1916 and sunk on 21 January 1919 while on way to surrender
- {{GS|U-40|1938}}, a Type IX submarine that served in the Second World War until sunk on 13 October 1939
U-40 or U-XL may also refer to: - {{SMU|U-40|Austria-Hungary}}, a {{sclass-|U-27|submarine (Austria-Hungary)|0}} submarine of the Austro-Hungarian Navy
{{Shipindex}}{{italic title prefixed|16}}{{DEFAULTSORT:U-040}} 1 : Submarines of Germany |