The King Charles III Stakes (formerly known as the George Main Stakes), is an Australian Turf Club Group 1 Thoroughbred horse race run under Weight for Age conditions, over a distance of 1600 metres at Randwick Racecourse, Sydney, Australia in September.

[1] The race was named after George Main, a former chairman of the Australian Jockey Club.

Main lived with his wife Mary on Retreat, a grazing property at Illabo, west of Cootamundra on the southwest slopes of New South Wales.

[2] The winner of the King Charles III Stakes is exempt from a ballot on the Epsom Handicap, and horses who run well often head for the Epsom.

[2] The race was renamed in honour of Charles III in July 2023.