S-13 was a Stalinets-class submarine of the Soviet Navy. Her keel was laid down by Krasnoye Sormovo in Gorky on 19 October 1938. She was launched on 25 April 1939 and commissioned on 31 July 1941 in the Baltic Fleet, under the command of Captain Pavel Malantyenko. The submarine is best known for the 1945 sinking of Wilhelm Gustloff, a German military transport ship. With a career total of 44,701 GRT sunk or damaged, she is the highest-scoring Soviet submarine in history.