SM UB-22 was a German Type UB II submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 30 April 1915 and launched on 9 October 1915. She was commissioned into the German Imperial Navy on 2 March 1915 as SM UB-22. The submarine sank 27 ships in 18 patrols for a total of . UB-22 was mined and sunk in the same incident with the torpedoboat in the North Sea at on 19 January 1918 in a British minefield.
Design
A German Type UB II submarine, UB-22 had a displacement of when at the surface and while submerged. She had a total length of , a beam of , and a draught of . The submarine was powered by two Körting six-cylinder, four-stroke diesel engines each producing a total , a Siemens-Schuckert electric motor producing , and one propeller shaft. She was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UB-22 was fitted with two torpedo tubes, four torpedoes, and one SK L/40 deck gun. She had a complement of twenty-one crew members and two officers and a 45-second dive time.