In military terms, 66th Division or 66th Infantry Division may refer to:Infantry divisions66th Infantry Division (Bangladesh) 66th Division 66th Division (Spain) 66th Division (Syria) 66th Division, a unit of the British Army in the First World War 66th Infantry Division, a unit of the British Army in the Second World War 66th Infantry Division, a unit of the United States ArmyCavalry divisions66th Cavalry Division, a unit of the United States ArmyRifle divisions66th Rifle Division, Red Army