K-8 was a November class submarine of the Soviet Northern Fleet.

On 13 October 1960, K-8 suffered a rupture of a steam generator tube, releasing reactor coolant into the engine room and seriously exposing 13 crewmen to ionizing radiation.

On 8 April 1970, K-8 suffered fires in two compartments simulateously. The captain ordered "abandon ship," saving his crew, but was countermanded. 52 crewmen, including the captain, re-boarded the submarine, and were lost when she sank in rough seas while being towed in the Bay of Biscay. A monument to the lost stands in Severomorsk.