Rachael Margaret Grinham (born 22 January 1977 in Toowoomba, Queensland) is an Australian professional squash player. She won the World Open in 2007, and the British Open in 2003, 2004, 2007 and 2009. She reached the World No. 1 ranking in August 2004 and held it for 16 consecutive months. She came out as gay in May 2017, Grinham and her girlfriend, Jenny Duncalf were the first two squash players to publicly come out while still active in professional play. Her younger sister Natalie Grinham is also a top squash player.