The 5th Mechanised Corps was a mechanised corps of the Red Army, formed three times. The corps was first formed in 1934 and was converted into a tank corps in 1938. It was reformed in the Far East in 1940 and moved west before the German invasion of the Soviet Union. It fought in the Battle of Smolensk (1941), losing large numbers of tanks in the Lepel counterattack. The corps was encircled in the Smolensk pocket and after breaking out was disbanded in late August. Its third formation was formed in September 1942 from the 22nd Tank Corps. The corps fought in Operation Little Saturn, Operation Gallop, the Battle of Smolensk (1943), the Dnieper–Carpathian Offensive, and the Jassy–Kishinev Offensive. In September 1944 it became the 9th Guards Mechanised Corps.