King Kamehameha was a Japanese Thoroughbred racehorse and sire. After winning both of his races as a two-year-old he established himself as the best colt of his generation in Japan in 2004 with a five-race winning streak including the Mainichi Hai, NHK Mile Cup, Tokyo Yushun and Kobe Shimbun Hai. After sustaining a tendon injury he was retired from racing with a record of seven wins and one third place from eight starts. He became one of the most successful breeding stallions in Japan winning two sires' championships.

The Mainichi Hai is a Grade 3 horse race for three-year-old Thoroughbreds run in March over a distance of 1800 metres at Hanshin Racecourse.