The British Army's 8th Infantry Division was active in both World War I and World War II.

The U.S. 8th Infantry Division was a military formation of the United States Army during the 20th Century. The division served in World War I, World War II and Operation Desert Storm.

The 8th Indian Infantry Division is a division of the Indian Army which specialised in tactics and operations in mountainous territory.

The French 8th Infantry Division was a French Army formation during World War II.

The 8th Infantry Division was a tactical unit of the Polish Army. It was active in the Polish-Bolshevik War, as well as during the Invasion of Poland in 1939. During World War II, the division was reformed twice as part of two distinct armed forces: once as part of the Home Army during the Warsaw Uprising and again as part of the Polish Army in the East.