SM UB-88 was a German Type UB III submarine or U-boat in the German Imperial Navy () during World War I. She was commissioned into the German Imperial Navy on 26 January 1918 as SM UB-88. UB-88 was surrendered to the United States of America on 26 November 1918 in accordance with the requirements of the Armistice with Germany. After an extensive tour along the U.S. coast, she was sunk as a target on 3 January 1921.