Sergey Semyonovich Biryuzov (Russian: Серге́й Семёнович Бирюзо́в; 21 August 1904 – 19 October 1964) was a Marshal of the Soviet Union and Chief of the General Staff.

He joined the Red Army in September 1922, studying at the 48th Rostov Infantry and Machine Gun and the 10th Vladikavkaz Courses in the North Caucasus Military District before transferring to the VTsIK Combined Military School in Moscow in October 1923.

Entering the Frunze Military Academy in June 1934, Biryuzov became chief of staff of the 30th Rifle Division following his graduation in October 1937.

He was acting division commander until February 1938 and in April of that year became chief of the operations department Kharkov Military District staff.

In April 1942, he was made the Chief of Staff of the 48th Army, which was a part of Bryansk Front.

After these commands, Biryuzov was made the Head of the Soviet Military Mission in Bulgaria, a position he held until May 1946, when he became deputy commander-in-chief of the Ground Forces for combat training.