Atlantic Jewel (26 September 2008 – 20 August 2020) was an Australian Thoroughbred racehorse. Sired by champion sire Fastnet Rock, and raced by Coolmore, Atlantic Jewel was trained by Melbourne's Mark Kavanagh. She won 10 of her 11 starts, including three Group One races. Her eighth start was the Memsie Stakes at Caulfield Racecourse, where she defeated eight rivals after a long injury break, and it confirmed her as Australia's best racehorse. She also won the 1000 Guineas at Caulfield Racecourse by three lengths, defeating four-time Group One winner Mosheen.