109th Brigade

109th Brigade may refer to:


 * 109th Indian Infantry Brigade,a unit of the British Indian Army during the Second World War
 * 109th Mixed Brigade, a mixed brigade of the Spanish Republican Army in the Spanish Civil War
 * 109th Brigade (United Kingdom), a unit of the British Army during the First World War
 * 109th Territorial Defense Brigade (Ukraine), a unit of the Ukrainian Territorial Defense Forces