K-429 (often incorrectly referred to as K-329) was a Project 670-A Скат (Skat, meaning "ray"; also known by its NATO reporting name of "Charlie-I" class) nuclear submarine of the Soviet Navy. Her keel was laid down on 26 January 1971 at Krasnoye Sormovo in Gorky. She was launched on 22 April 1972, and was commissioned on 31 October 1972 into the Soviet Pacific Fleet.