Soviet submarine K-3

Soviet submarine K-3 may refer to one of the following submarines of the Soviet Navy:


 * SOVIET SUBMARINE K-3, a K-class submarine sunk by German vessels in March 1943
 * SOVIET SUBMARINE K-3 Leninsky Komsomol, a November-class (or Project 627) submarine which suffered a fire in September 1967 in the Mediterranean that killed 39 crewmen