HMAS Mercedes was an auxiliary minesweeper of the Royal Australian Navy (RAN) between 1942 until 1946. Built in 1913 for the Ocean Steam Ship Co. she was sold to the Straits Steam Ship Co. in 1925. She was requisitioned by the Royal Navy in 1939 and converted into an auxiliary minesweeper and named HMS Medusa. She was transferred to the Royal Australian Navy in 1942 and renamed HMAS Mercedes until she was returned to her owners in 1946. She was sold and was scuttled off Sydney on 23 January 1948.