The Australian Derby is an Australian Turf Club Group 1 Thoroughbred horse race for three-year-olds at set weights held at Randwick Racecourse, Sydney, Australia in April, during the Autumn ATC Championships Carnival.

[1] Inaugurated in 1861 as the AJC Randwick Derby Stakes, the first race was won by Kyogle, a grandson of the Touchstone who was a four-time Champion sire in Great Britain & Ireland.

The official records show that Prince Humphrey won the 1928 Derby, but he wasn't in the race.

This substitution came to light when Dick Tate of Toowoomba saw a picture of the Derby winner and was aware that Prince Humphrey had different markings, and had photographs to prove it.

Originally run at a distance of 1+1⁄2 miles, in 1972 the race was changed to 2,400 metres (~11.93 furlongs) to conform to the metric system.