Leonid Kostyantynovych Kadenyuk (, 28 January 1951 – 31 January 2018) was an Ukrainian astronaut. He was the first astronaut of independent Ukraine. He flew on NASA's Space Shuttle Columbia in 1997 as part of the international mission STS-87. Kadeniuk held the rank of Major General in the Ukrainian Air Force. He was born in Klishkivtsi, Chernivtsi Oblast.