HMAS Mary Cam was an auxiliary minesweeper operated by the Royal Australian Navy (RAN) during World War II. She was launched in 1918 by Ritchie, Graham & Milne, Whiteinch at Glasgow as Joule. The ship operated in Australian waters from 1928, and was requisitioned by the RAN on 5 October 1939. She was returned to her owners after the war and was later scrapped in 1957.