109th Brigade may refer to:
British India 109th Indian Infantry Brigade, a unit of the British Indian Army during World War II
Germany 109th Panzer Brigade
Spain 109th Mixed Brigade, a mixed brigade of the Spanish Republican Army in the Spanish Civil War
United Kingdom 109th Brigade (United Kingdom), a British Army formation during World War I 109th (Howitzer) Brigade, Royal Field Artillery, a British Army unit during World War I 109th Territorial Defense Brigade, a unit of the Ukrainian Territorial Defense Forces
See also 109th Division (disambiguation) 109th Regiment (disambiguation)