The 4th Battalion was an infantry battalion of the Australian Army. Originally raised as part of the First Australian Imperial Force during the First World War, the battalion formed part of the 1st Brigade, attached to the 1st Division. During the war the battalion fought at Gallipoli and in the trenches on the Western Front, before being disbanded in 1919. In 1921, the battalion was re-raised as a militia unit and designated as the "4th Battalion (Australian Rifles)", adopting the designation of the Australian Rifles militia unit from which many of the battalion's recruits had come during the war. In 1930, the battalion was amalgamated with the 3rd Battalion (Werriwa Regiment) and they remained linked until 1936, when they were delinked.