SM UA was a U-boat of the Imperial German Navy during World War I. Built as the fifth submarine of the Norwegian A class the boat was launched 9 May 1914 and confiscated by the German government after the outbreak of World War I on 5 August 1914. Commissioned as SM U 0 on 14 August 1914 the boat was renamed UA two weeks later and assigned to coastal protection. In 1916 UA was transferred to the Uschule.