The 12th Brigade was an infantry brigade of the Australian Army. It was initially raised in 1916 as part of the expansion of the First Australian Imperial Force, which was Australia's overseas volunteer force during World War I. Attached to the 4th Division and consisting of four infantry battalions—the 45th, 46th, 47th and 48th Battalions—it served in the trenches of the Western Front from June 1916 onwards. In May 1918, the brigade was one of three that was selected to disband one of its battalions in order to provide reinforcements to other units in the Australian Corps and it was at this time that the 47th Battalion was disbanded. Following the end of hostilities, the brigade was disbanded in early 1919.