HMAS HDML 1321, also known as Rushcutter was a 58-ton Harbour Defence Motor Launch of the Royal Australian Navy (RAN). Built by Purdon & Featherstone, Battery Point, Hobart, Tasmania and commissioned into the RAN on 11 November 1943. She was assigned to Z Special Unit and delivered commandos for the 1945 ill-fated raid on Muschu Island. She was later reclassified as a Seaward Defence Boat. Sold in August 1971, she was converted to a pleasure craft and is now located in Northern Australia.