The 166th Rifle Division was an infantry division of the Soviet Union's Red Army that fought in World War II, formed twice. The division's first formation was formed in 1939 and wiped out in the Vyazma Pocket in October 1941. In January 1942, the division reformed. It fought in the Battle of Demyansk, the Battle of Kursk, Belgorod-Khar'kov Offensive Operation, Vitebsk–Orsha Offensive, Polotsk Offensive, Šiauliai Offensive, Riga Offensive and the Battle of Memel. It was awarded the Order of the Red Banner.