The 2/1st Medium Regiment was an artillery regiment of the Australian Army during World War II. Raised in 1940 as part of the all volunteer Second Australian Imperial Force, the regiment undertook garrison duties in Australia, Nauru and on Ocean Island, and served in the Middle East. It was converted to a field regiment, designated the 2/13th Army Field Regiment, due to a lack of howitzers, but was later converted back into a medium regiment. During 1943–1944, the regiment served as the 2/13th Composite Anti Aircraft Regiment before returning to the medium role. It was disbanded in July 1945, in Queensland.