# List of Australian Army units

In March 1901, the Australian Army came into existence as the Commonwealth Military Forces through the amalgamation of the former colonies military forces. The existing regiments and battalions of the colonies were reorganised and renumbered due to their absorption into the national army and subsequently formed the first military units of a united Australia. At the outbreak of World War I, in July 1914, the Australian Government committed the First Australian Imperial Force (AIF), a fully volunteer force, to the war; all existing units were exempt from serving overseas due the Defence Act of 1903, which stipulated that they could only serve in Australian territory.
In 1921, the Citizens Force's regimental numbering system, used since federation, was replaced by a divisional structure when the Australian Government decided to continue the unit designations of the AIF and to continue the traditions of the units of World War I. This renumbering brought about the end of localised regiments, with battalions taking up their role as community recruitment organisations.
In 1939, following the start of World War II the Australian Government created the Second Australian Imperial Force which would see combat in North Africa and the Pacific.
This list covers individual units, above or equivalent to a battalion, which were created or maintained after 1914, by either being militia units that were amalgamated and/or renumbered or being entirely new entities.

## Armies

The field army has been the largest ever created unit for the Australian Army and has only been utilised in the Second World War.
* First Army
* Second Army

## Corps

In the history of the Australian Army, only during the world wars were tactical corps units raised.

### World War I

* Australian Corps
* Australian and New Zealand Army Corps
* I ANZAC Corps
* II ANZAC Corps

### World War II

* I Corps
* II Corps
* III Corps

## Divisions
### Infantry
#### Active

* 1st Division
* 2nd Division

#### Former

* 3rd Division
* 4th Division
* 5th Division
* 6th Division
* 7th Division
* 8th Division
* 9th Division
* 10th Division
* 11th Division
* 12th Division

### Light Horse
#### Former

* ANZAC Mounted Division
* Australian Mounted Division

### Armoured
#### Former

* 1st Armoured Division
* 2nd Armoured Division
* 3rd Armoured Division

## Brigades
### Infantry
#### Active

* 1st Brigade
* 2nd Brigade
* 3rd Brigade
* 4th Brigade
* 5th Brigade
* 7th Brigade
* 8th Brigade
* 9th Brigade
* 11th Brigade
* 13th Brigade
* 16th Aviation Brigade
* 17th Sustainment Brigade

#### Former

* 6th Brigade
* 10th Brigade
* 12th Brigade
* 14th Brigade
* 15th Brigade
* 16th Brigade
* 17th Brigade
* 18th Brigade
* 19th Brigade
* 20th Brigade
* 21st Brigade
* 22nd Brigade
* 23rd Brigade
* 24th Brigade
* 25th Brigade
* 26th Brigade
* 27th Brigade
* 28th Brigade
* 29th Brigade
* 30th Brigade
* 31st Brigade
* 32nd Brigade
* 33rd Brigade
* 34th Brigade

### Armoured
#### Former

* 1st Armoured Brigade
* 2nd Armoured Brigade
* 4th Armoured Brigade
* 6th Armoured Brigade

## Regiments
### Infantry
#### Administrative

* Royal Australian Regiment
* Royal New South Wales Regiment
* Royal Victoria Regiment
* Royal Queensland Regiment
* Royal South Australia Regiment
* Royal Western Australia Regiment
* Royal Tasmania Regiment

#### Functional

* 1st Commando Regiment
* 2nd Commando Regiment
* Special Air Service Regiment (SASR)
* Pilbara Regiment
* NORFORCE

### Engineer

* 1st Combat Engineer Regiment
* 2nd Combat Engineer Regiment
* 3rd Combat Engineer Regiment
* 5th Engineer Regiment
* 6th Engineer Support Regiment
* Special Operations Engineer Regiment (SOER)

### Armoured
#### Cavalry

* 1st Armoured Regiment
* 2nd Cavalry Regiment
* 3rd Cavalry Regiment
* 4th Cavalry Regiment

#### Light Horse

* 1st Royal New South Wales Lancers
* 2nd Light Horse Regiment
* 3rd Light Horse Regiment
* 4th Light Horse Regiment
* 5th Light Horse Regiment
* 6th Light Horse Regiment
* 7th Light Horse Regiment
* 8th Light Horse Regiment
* 9th Light Horse Regiment
* 10th Light Horse Regiment
* 11th Light Horse Regiment
* 12th Light Horse Regiment
* 13th Light Horse Regiment
* 14th Light Horse Regiment
* 15th Light Horse Regiment
* 16th Light Horse Regiment
* 17th Light Horse Regiment
* 18th Light Horse Regiment
* 19th Light Horse Regiment
* 20th Light Horse Regiment
* 21st Light Horse Regiment
* 22nd Light Horse Regiment
* 23rd Light Horse Regiment
* 24th Light Horse Regiment
* 25th Light Horse Regiment

### Artillery

* 1st Regiment
* 2nd Regiment
* 4th Regiment
* 8th Regiment
* 9th Regiment
* 10th Regiment
* 12th Regiment
* 15th Regiment
* 16th Regiment
* 20th Regiment
* 22nd Regiment

## Battalions
### Infantry
#### Royal Australian Regiment

Battalions of the Royal Australian Regiment (RAR) were formed in the aftermath of the Second World War, when Australian defence policymakers government decided to exchange the focus on the Militia to a permanent force. The battalions are as follows:

##### Active

* 1st Battalion, Royal Australian Regiment
* 2nd Battalion, Royal Australian Regiment
* 3rd Battalion, Royal Australian Regiment
* 5th/7th Battalion, Royal Australian Regiment
* 6th Battalion, Royal Australian Regiment
* 8th/9th Battalion, Royal Australian Regiment

##### Former

* 2nd/4th Battalion, Royal Australian Regiment
* 4th Battalion, Royal Australian Regiment
* 5th Battalion, Royal Australian Regiment
* 7th Battalion, Royal Australian Regiment
* 8th Battalion, Royal Australian Regiment
* 9th Battalion, Royal Australian Regiment

#### First Australian Imperial Force

Battalions of the First Australian Imperial Force (AIF) were initially formed in the First World War as volunteer units for overseas service. The battalions are as follows:
* 1st Battalion
* 2nd Battalion
* 3rd Battalion
* 4th Battalion
* 5th Battalion
* 6th Battalion
* 7th Battalion
* 8th Battalion
* 9th Battalion
* 10th Battalion
* 11th Battalion
* 12th Battalion
* 13th Battalion
* 14th Battalion
* 15th Battalion
* 16th Battalion
* 17th Battalion
* 18th Battalion
* 19th Battalion
* 20th Battalion
* 21st Battalion
* 22nd Battalion
* 23rd Battalion
* 24th Battalion
* 25th Battalion
* 26th Battalion
* 27th Battalion
* 28th Battalion
* 29th Battalion
* 30th Battalion
* 31st Battalion
* 32nd Battalion
* 33rd Battalion
* 34th Battalion
* 35th Battalion
* 36th Battalion
* 37th Battalion
* 38th Battalion
* 39th Battalion
* 40th Battalion
* 41st Battalion
* 42nd Battalion
* 43rd Battalion
* 44th Battalion
* 45th Battalion
* 46th Battalion
* 47th Battalion
* 48th Battalion
* 49th Battalion
* 50th Battalion
* 51st Battalion
* 52nd Battalion
* 53rd Battalion
* 54th Battalion
* 55th Battalion
* 56th Battalion
* 57th Battalion
* 58th Battalion
* 59th Battalion
* 60th Battalion
* 61st Battalion
* 62nd Battalion
* 63rd Battalion
* 64th Battalion

#### Second Australian Imperial Force

Battalions of the Second Australian Imperial Force (AIF) were initially formed in the Second World War as volunteer units for overseas service. The battalions are as follows:
* 2/1st Battalion
* 2/2nd Battalion
* 2/3rd Battalion
* 2/4th Battalion
* 2/5th Battalion
* 2/6th Battalion
* 2/7th Battalion
* 2/8th Battalion
* 2/9th Battalion
* 2/10th Battalion
* 2/11th Battalion
* 2/12th Battalion
* 2/13th Battalion
* 2/14th Battalion
* 2/15th Battalion
* 2/16th Battalion
* 2/17th Battalion
* 2/18th Battalion
* 2/19th Battalion
* 2/20th Battalion
* 2/21st Battalion
* 2/22nd Battalion
* 2/23rd Battalion
* 2/24th Battalion
* 2/25th Battalion
* 2/26th Battalion
* 2/27th Battalion
* 2/28th Battalion
* 2/29th Battalion
* 2/30th Battalion
* 2/31st Battalion
* 2/32nd Battalion
* 2/33rd Battalion
* 2/40th Battalion
* 2/43rd Battalion
* 2/48th Battalion

### Machine Gun
#### First Australian Imperial Force

* 1st Machine Gun Battalion
* 2nd Machine Gun Battalion
* 3rd Machine Gun Battalion
* 4th Machine Gun Battalion
* 5th Machine Gun Battalion

#### Second Australian Imperial Force

* 2/1st Machine Gun Battalion
* 2/2nd Machine Gun Battalion
* 2/3rd Machine Gun Battalion
* 2/4th Machine Gun Battalion

### Pioneer
#### First Australian Imperial Force

* 1st Pioneer Battalion
* 2nd Pioneer Battalion
* 3rd Pioneer Battalion
* 4th Pioneer Battalion
* 5th Pioneer Battalion

#### Second Australian Imperial Force

* 2/1st Pioneer Battalion
* 2/2nd Pioneer Battalion
* 2/3rd Pioneer Battalion
* 2/4th Pioneer Battalion

## Citations

* ↑ "Royal Australian Armoured Corps". Australian Army. Retrieved 19 October 2020.
* ↑ "Army Order of Battle". Australian Army. January 2018. Retrieved 19 October 2020.