| First Army | |
|---|---|
 An Australian light machine gun team in action near Wewak in June 1945 | |
| Active | 1942–1946 |
| Country |  Australia |
| Branch | Australian Army |
| Engagements | World War II |
| Commanders | |
| Notable commanders | John Lavarack Vernon Sturdee Horace Robertson |
| Insignia | |
| Unit colour patch |  |
The First Australian Army was a field army of the Australian Army, during World War II. The formation's headquarters was raised in April 1942 from the existing 1st Australian Corps headquarters, assuming command of all Allied troops in Queensland. Initially, the formation was assigned a defensive role in anticipation of a possible Japanese invasion; however, this threat subsided and eventually the army was deployed to Lae, in New Guinea, in late 1944, where it co-ordinated Australian offensives around Aitape, in New Guinea, on New Britain and Bougainville, and around Madang. The formation was disbanded in February 1946, when it was redesignated as the 8th Military District.