Deep Sky (ディープスカイ) (born May 11, 2005) is a Japanese racehorse which won the 2008 Tokyo Yūshun and NHK Mile Cup.

However, Deep Sky won in Mainichi Hai at the end of March 2008, allowing entry in the NHK Mile Cup which is one of the big races for a three-year-old horse.

[7] However, Deep Sky was not able to win either races, with the horse losing once again to Vodka at Yasuda,[8] and to Dream Journey at Takarazuka.

[9] The horse was put to pasture at the Fantast Club in Hidaka with the intention to race in the autumn season again.

Before retiring from stud in 2021,[13] he sired two Grade 1 race winners; Sound Sky (Zen-Nippon Nisai Yushun) and Kyoei Gere (Japan Dirt Derby).