| 9th Brigade | |
|---|---|
&sq=&lang=&file=File:AWM_E02960_34th_Battalion_AIF_Picardie_France_21_August_1918.jpg) Troops from the 34th Battalion—part of the 9th Brigade—at Picardie, 21 August 1918 | |
| Active | 1912–present |
| Country |  Australia |
| Branch | Army |
| Size | 1,100 (regular) 1,700 (reserve) |
| Part of | Forces Command |
| Garrison/HQ | Keswick, South Australia |
| Motto(s) | Non nobis sed patriae (Not for self but for country)[1] |
| Engagements | World War I |
| Commanders | |
| Notable commanders | Charles Rosenthal |
| Insignia | |
| Unit colour patch | &sq=&lang=&file=File:9th_Brigade_HQ_Unit_Colour_Patch.png){kind=small} |
The 9th Brigade is a Reserve formation of the Australian Army headquartered at Keswick Barracks in Keswick, South Australia, with elements located in New South Wales and South Australia. The brigade was first raised in 1912 in New South Wales following the introduction of the compulsory training scheme.
During World War I, the brigade was formed as part of the First Australian Imperial Force in 1916, with the majority of its recruits coming from New South Wales. It was assigned to the 3rd Division, and training was carried out in the United Kingdom before the brigade was committed to the fighting on the Western Front in November 1916. It fought in numerous battles in France and Belgium for the next two years.
After the war, the brigade was disbanded, but was re-raised as a part-time formation in the Sydney area. During World War II, the brigade was mobilised for defensive duties, but did not see active service before it was disbanded in June 1944. In the post war period, the 9th Brigade was re-raised once again as a part-time formation, and forms part of the 2nd Division.