U-117 may refer to one of the following German submarines:
- SM U-117, a Type UE II submarine launched in 1917 that served in World War I and was surrendered in 1918
- During World War I, Germany also had this submarine with a similar name:
- SM UB-117, a Type UB III submarine launched in 1917 and was surrendered in 1918
- During World War I, Germany also had this submarine with a similar name:
- German submarine U-117 (1941), a Type XB submarine that served in the Second World War and sank on 7 August 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.