Australia II is an Australian 12-metre-class America's Cup challenge racing yacht that was launched in 1982 and won the 1983 America's Cup for the Royal Perth Yacht Club. Skippered by John Bertrand, she was the first successful Cup challenger, ending a 132-year tenure by the New York Yacht Club.

The Royal Perth Yacht Club (RPYC) is a yacht club in Perth, Western Australia. It is the third oldest yacht club in Australia after the Royal Yacht Club of Victoria and the Royal Sydney Yacht Squadron. It is based at the Crawley Marina on Pelican Point and at the Fremantle Annexe in Challenger Harbour.