The 3rd/9th Light Horse (South Australian Mounted Rifles) (3/9 SAMR) is a Reserve light cavalry regiment of the Australian Army based in Smithfield, South Australia. Part of the Royal Australian Armoured Corps (RAAC), the regiment is attached to the 9th Brigade, 2nd Division and currently operates G-Wagon SRV 6x6 and Bushmaster Protected Mobility Vehicles. On 26 October 2022, 9th Brigade transitioned as a Direct Command to Forces Command (FORCOMD) as part of an Army wide transformation. 3rd/9th Light Horse (South Australian Mounted Rifles), 1st Armoured Regiment officially commenced on 1 November 2022.