The Caulfield Guineas is a Melbourne Racing Club Group 1 Thoroughbred horse race held over 1600 metres (1 mile) at set weights for three-year-old horses at Caulfield Racecourse, Melbourne, Australia. Total prize money is A$3 million. The race is held annually on the second Saturday in October and forms part of the Melbourne Spring Racing Carnival at Caulfield Racecourse. The Guineas, as the race is known, starts the three-day Caulfield carnival; the G1 Toorak Handicap, G1 Caulfield Stakes and the fillies equivalent, the G1 The Thousand Guineas are also held on Guineas day.