HMAS Allenwood (FY18) was an auxiliary minesweeper operated by the Royal Australian Navy (RAN) during World War II.

She was launched in 1920 by Ernst Wright at Tuncurry, New South Wales, Australia as Allenwood for Allen Taylor and Co. Ltd.

The ship operated along the east coast of Australia, and was requisitioned by the RAN on 27 July 1941.

She was decommissioned into reserve on 31 November 1944[verification needed] and returned to the owner, Allen Taylor & Co Ltd on 1 October 1946.

On 14 September 1951, under the command of Captain Boutrup, Allenwood ran aground on a sandbank at Birdie Beach, Munmorah National Park, north of Norah Head, New South Wales33°12′08″S 151°36′48″E / 33.202186°S 151.613235°E / -33.202186; 151.613235, in foggy conditions.