Kasyan Alexandrovich Chaykovsky (Russian: Касьян Александрович Чайковский; February 1893 – 23 April 1938) was a Soviet military officer and Red Army Komkor. Born in the family of a lawyer, Chaykovsky became a law student at Moscow State University. He volunteered for the First Balkan War and fought with the Serbian Army. Chaykovsky was wounded twice and returned to the university in January 1913. He volunteered for the Imperial Russian Army after World War I began and became an officer. He was seriously wounded and captured by German troops in 1915. Chaykovsky remained in a POW camp until October 1918, when he joined the Red Army. He became a commissar and then a VOHR officer in the Russian Civil War.