The Caulfield Guineas is a Melbourne Racing Club Group 1 Thoroughbred horse race held over 1600 metres at set weights for three-year-old horses at Caulfield Racecourse, Melbourne, Australia.

Lonhro, nicknamed The Black Flash, was an Australian champion racehorse. He was from the first crop of the champion Octagonal out of the Group One-placed Shadea, who also produced the Group One winner