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 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.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate20 October 1916Drafn774Sunk21 October 1916Antoinette912Sunk21 October 1916Theodor234Sunk22 October 1916Caerloch659Sunk22 October 1916Gunn483Sunk27 October 1916Sif377Sunk29 October 1916Falkefjell1,131Sunk5 February 1917Resolute125Sunk6 February 1917Adelaide133Sunk6 February 1917Romeo114Sunk6 February 1917Rupert114Sunk7 February 1917Boyne Castle245Sunk7 February 1917Shakespeare210Sunk9 February 1917Benbow172Sunk9 February 1917Duke of York150Sunk10 February 1917Athenian171Sunk10 February 1917Bellax1,107Sunk10 February 1917Ireland152Sunk28 March 1917Oakwell248Sunk29 April 1917Dilston Castle129Sunk30 April 1917Argo131Sunk16 June 1917Inge336Sunk4 August 1917Azira1,144Sunk6 August 1917Jenny293Sunk6 August 1917Narcissus58Sunk7 November 1917Suntrap1,353Sunk13 December 1917Garthwaite5,690Sunk
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