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Leonid Denisovich Kizim (Кизим Леонид Денисович) (August 5, 1941 – June 14, 2010) was a Soviet cosmonaut.

Kizim was born in Krasnyi Lyman, Donetsk Oblast, Soviet Union (now Ukraine). He graduated from Higher Air Force School in 1975; and served as a test pilot in the Soviet Air Force. He was selected as a cosmonaut on October 23, 1965. Kizim flew as Commander on Soyuz T-3, Soyuz T-10 and Soyuz T-15, and also served as backup commander for Soyuz T-2. All together he spent 374 days 17 hours 56 minutes in space. On Soyuz T-15, he was part of the only crew to visit two space stations on one spaceflight (Mir and Salyut 7). He later served as Deputy Director Satellite Control-Center of the Russian Ministry of Defense; after May 1995 he was Director of the Military Engineering Academy of Aeronautics and Astronautics in St. Petersburg.