9th Combat Service Support Battalion (9 CSSB) is a unit of the 9th Brigade of the Australian Army. Originally formed as 9th Brigade Administrative Support Battalion (9 BASB), 9 CSSB is a part-time Army (Reserve) unit. The unit is based at Warradale Barracks Adelaide as well as a small sub-unit in Tasmania.

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The role of 9 CSSB is to provide first and limited second line support to its customer units within the 9th Brigade.

• Australian Army - 9 CSSB Archived 12 June 2018 at the Wayback Machine