Eighth Army may refer to:
Military units 8th Army (German Empire) 8th Army (RSFSR), a unit of the Red Army during the Russian Civil War 8th Army (Russian Empire) 8th Army (Soviet Union) 8th Army (Wehrmacht) 8th Guards Combined Arms Army, a unit of the Soviet Army 8th Guards Combined Arms Army (Russia) Eighth Area Army, a unit of the Imperial Japanese Army during World War II Eighth Army (France) Eighth Army (Italy) Eighth Army (Ottoman Empire) Eighth Army (United Kingdom) Eighth Army (United States) Eighth Route Army, a unit of the National Revolutionary Army during World War II
Other uses 8th Army (board game), a 1982 board wargame