Kasyan Alexandrovich Chaykovsky (Russian: Касьян Александрович Чайковский; February 1893 – 23 April 1938) was a Soviet military officer and Red Army Komkor.

In February 1936 he became deputy head of the 2nd Department (Organization and Mobilization) of the Red Army General Staff.

He fought in World War I, serving with the 211th Nikolskoye Infantry Regiment as a Praporshchik and company commander.

He became chief of the prisoners and refugees echelon and commissar of the military-sanitary institutions on the Alexandrovsky Railway.

In January 1919, he became a board member, head of supply, and chairman of the Smolensk Provincial Committee of Prisoners and Refugees.

Chaykovsky became acting commander of the 5th Army and the East Siberian Military District in August 1922.

He studied at the Higher Academic Courses at the Military Academy of the Red Army from September 1923.

Between July and September 1924 Chaykovsky led the 2nd Separate Caucasian Cavalry Brigade in the suppression of the August Uprising.

At the same time, he was acting head of the training department and assistant chief of the Evening Military Academy of the Red Army.

[3] In February 1936, he became deputy head of the 2nd department (Organization and Mobilization) of the General Staff of the Red Army.

Chaykovsky was arrested on 21 May 1937 at his dacha in the Pokrovskoye-Streshnevo District after suffering a heart attack, during the Great Purge.