The Arima Kinen (有馬記念) is a Grade I flat horse race in Japan open to Thoroughbreds which are three-years-old or above and the world's largest betting horserace. It is run over a distance of 2,500 metres (approximately 1 mile and 4+1⁄2 furlongs) at Nakayama Racecourse, and it takes place annually in late December. It is one of the two "All-Star" races in Japanese horse racing; the other is the Takarazuka Kinen in late June.