Boris Valentinovich Volynov (Russian: Борис Валентинович Волынов; born December 18, 1934 in Irkutsk) is a Soviet cosmonaut who flew two space missions of the Soyuz programme: Soyuz 5, and Soyuz 21.
He is a graduate of the Soviet Military Engineering Academy and held the rank of Colonel in the Soviet Air Force. After resigning from the space programme in 1982, he spent eight years as a senior administrator at the Gagarin Cosmonaut Training Centre. He is presently retired.