The 5th/7th Battalion, Royal Australian Regiment (Mechanised) (5/7 RAR [MECH]) was a mechanised infantry battalion of the Australian Army. The battalion was based at Robertson Barracks in Palmerston, Northern Territory and formed part of the 1st Brigade. It was formed in 1973 by linking both the 5th and 7th Battalions of the Royal Australian Regiment together. In late 2006, as part of the expansion of the Australian Army, the unit was broken up into two separate battalions once again.