The 7th Machine Gun Battalion was a battalion of the Australian Army that was raised for service during World War II. Formed in late 1942 from the machine gun companies of several infantry battalions, the 7th Machine Gun Battalion undertook defensive duties around Port Moresby and Milne Bay during the New Guinea campaign before taking part in the defence of Wau airfield during the Battle of Wau in early 1943. The battalion was returned to Australia in late 1943 and subsequently disbanded in mid-1944.