U-79 may refer to one of the following German submarines:
- SM U-79, a Type UE I submarine launched in 1916 and that served in World War I until surrendered 21 November 1918; became the French submarine Victor Reveille; broken up in 1935
- During World War I, Germany also had these submarines with similar names:
- SM UB-79, a Type UB III submarine launched in 1917 and surrendered on 26 November 1918; broken up at Swansea in 1922
- SM UC-79, a Type UC II submarine launched in 1916 and sunk after 5 April 1918
- During World War I, Germany also had these submarines with similar names:
- German submarine U-79, a Type VIIC submarine that served in World War II until sunk on 23 December 1941
- The number SM U-79 in the Austro-Hungarian Navy was assigned to SM UB-49 when serving in the Mediterranean during World War I.
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.