The 51st Rifle Division was an infantry division of the Soviet Army, formed twice. Its first formation was formed during the Russian Civil War and fought in the Perekop-Chongar Offensive in 1920. It also fought in the Soviet invasion of Poland, Winter War and World War II. During World War II, it fought in the Battle of Rostov, Barvinkove-Losowaja Operation and Second Battle of Kharkov before being destroyed at the Battle of Voronezh. Officially disbanded on 28 November 1942, the division was reformed on 15 April 1943 from the 15th Rifle Brigade. The 2nd formation fought in Operation Bagration and the Battle of Königsberg. It appears to have been disbanded in 1946.