The Arlington Million is a Grade 1 flat horse race in the United States for thoroughbred horses aged three years and upward on the turf. It was originally raced at the now-closed Arlington Park in Arlington Heights, Illinois over a distance of 1+1⁄4 miles. In 2022, it will be moved to Churchill Downs. The Arlington Million is the first thoroughbred race to offer a purse of US$1,000,000. It is part of the Breeders' Cup Challenge series, and the winner automatically qualifies for the Breeders' Cup Turf.