SM UB-122 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 4 March 1918 as SM UB-122.
UB-122 was surrendered to the British on 24 November 1918 in accordance with the requirements of the Armistice with Germany. She may have been broken up in 1921, have been marooned on a sandbank at Hoo on the River Medway, or have foundered in the North Sea off the east coast of England in 1921
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