| Unit Name: | 13th Combat Service Support Battalion |
| Dates: | March 1995 – present |
| Country: |  Australia |
| Branch: | Army |
| Type: | Logistics and Health Support |
| Size: | Headquarters and four sub-units |
| Command Structure: | 13th Brigade |
| Garrison: | HQ at Irwin Barracks |
| Motto: | Soldiers Supporting Soldiers |
| Mascot: | Woylie |
| Commander1: | Lieutenant Colonel Shaun Fenn |
| Commander1 Label: | Commanding Officer |
13th Combat Service Support Battalion (13 CSSB) is a unit of the 13th Brigade of the Australian Army Reserve. Located in Western Australia, it is the logistics component of the 13th Brigade.
The battalion was formed in March 1995 and was previously designated the 13th Brigade Administrative Support Battalion. On formation, it consisted of the following sub-units:[1]
13 CSSB was granted "Freedom of Entry" to the City of Fremantle on 1 October 2001. Its motto is ″Soldiers Supporting Soldiers″.[1]
The role of 13 CSSB is to provide service and logistics support to the 13th Brigade and wider Australian Army. A Reserve unit, it is based at Irwin Barracks,[1] and as of February 2020, 13 CSSB comprises a battalion headquarters and four sub-units: