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 (Submarine School). After the Armistice with Germany in November 1918 UA was surrendered to France and ultimately broken up at Toulon in 1920-21.