SM UC-79 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy () during World War I.
A Type UC II submarine, UC-79 had a displacement of when at the surface and while submerged. She had a length overall of , a beam of , and a draught of . The submarine was powered by two six-cylinder four-stroke diesel engines each producing (a total of ), two electric motors producing , and two propeller shafts. She had a dive time of 30 seconds and was capable of operating at a depth of .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-79 was fitted with six mine tubes, eighteen UC 200 mines, three torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one Uk L/30 deck gun. Her complement was twenty-six crew members.
UC-79 was ordered on 12 January 1916 and was launched on 19 December 1916. She was commissioned into the Imperial German Navy on 22 January 1917 as SM UC-79. In eleven patrols UC-79 was credited with sinking 10 ships, either by torpedo or by mines laid. On 28 April 1917, she captured the Danish coaster in the Skagerrak. UC-79 was sunk by a mine off Cap Gris Nez, France in late March or early April 1918. Royal Navy divers located the wreck in that area in August 1918.