The 2nd/4th Battalion Royal Australian Regiment (2/4 RAR) was an Australian Army infantry battalion. 2/4 RAR was formed on 15 August 1973 by linking 2nd Battalion, Royal Australian Regiment and 4th Battalion, Royal Australian Regiment. 2/4 RAR was unlinked to re-form 2 RAR and 4 RAR on 1 February 1995. Throughout its existence 2/4 RAR was based at Lavarack Barracks in Townsville and formed part of the 3rd Brigade.