The 20th Minesweeping Flotilla was a Royal Australian Navy minesweeping flotilla that operated during the Second World War. Formed on 9 December 1939 and styled in the naming convention for minesweeping flotilla names used by the Royal Navy, the flotilla consisted of HMAS Swan, Yarra, Doomba and Orara. The makeup of the flotilla changed during the course of the war.
