SM UB-19 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 2 September 1915. She was commissioned into the German Imperial Navy on 16 December 1915 as SM UB-19. The submarine sank 13 ships in 15 patrols for a total of . UB-19 was sunk in the English Channel at on 30 November 1916 by British Q ship (Q 7).
Design
A German Type UB II submarine, ‘’UB-19’’ had a displacement of when at the surface and while submerged. They had a length overall of , a beam of , and a draught of . The submarine was powered by two Daimler six-cylinder four-stroke diesel engines each producing (a total of ), two Siemens-Schuckert electric motors producing , and one propeller shaft. She had a dive time of 32 seconds and was capable of operating at a depth of .
The submarine's top submerged speed was 5.81 knots and its top surface speed was 9.15 knots (16.95 km/h; 10.53 mph). When submerged, she could operate for at ; when surfaced she could travel at . UB-19 was fitted with two torpedo tubes in the bow, four torpedoes, and one Tk L/40 deck gun. Her complement was twenty-three crew members.