49th Brigade or 49th Infantry Brigade may refer to:
Germany 49th Landwehr Brigade
India 49th Indian Brigade of the British Indian Army in the First World War 49th Indian Infantry Brigade of the British Indian Army in the Second World War
Russia/Soviet Union 49th Anti-Aircraft Missile Brigade
Spain 49th Mixed Brigade, a unit of the Spanish Republican Army
Ukraine 49th Artillery Brigade (Ukraine) 49th Demining Brigade
United Kingdom 49th Brigade (United Kingdom), a World War I formation of the British Army 49th Infantry Brigade (United Kingdom), a Cold War formation of the British Army Artillery brigades 49th (Howitzer) Brigade, Royal Field Artillery 49th (West Riding) Trench Mortar Brigade, Royal Field Artillery
United States 49th Military Police Brigade (United States)
See also 49th Division (disambiguation) 49th Regiment (disambiguation) 49th Squadron (disambiguation)