Soviet submarine K-56

Soviet submarine K-56 may refer to one of the following submarines of the Soviet Navy:


 * SOVIET SUBMARINE K-56, a K-class submarine; completed after World War II; sunk in nuclear tests in 1957
 * SOVIET SUBMARINE K-56, an Echo II-class (or Project 675) nuclear submarine; collided with merchant ship in June 1973, killing 27 men aboard

K-56 (苏联潜艇)