Deep Sky (ディープスカイ) is a Japanese racehorse which won the 2008 Tokyo Yūshun and NHK Mile Cup.

The Tōkyō Yūshun (東京優駿), also called the Japanese Derby is a Grade 1 flat horse race in Japan for three-year-old thoroughbred colts and fillies run over a distance of 2,400 metres at the Tokyo Racecourse, Fuchū, Tokyo in late May or early June.