HMAS Mavie was a 19-ton auxiliary patrol boat operated by the Royal Australian Navy (RAN) during World War II. The wooden lugger Mavie was built at Fremantle, Western Australia in 1903. It was long, with a beam of . On 12 December 1941, Mavie was seized from its Japanese owner, Jiro Muramats, as he was a citizen of a country at war with Australia. It was requisitioned by the RAN, and was renamed and commissioned for service at Darwin as the channel patrol boat HMAS Mavie, on 31 December 1941.