Blast Onepiece, (Japanese: ブラストワンピース, foaled 2 April 2015) is a Japanese Thoroughbred racehorse. After winning his only start as a two-year-old he improved to become the best colt of his generation in Japan in the following year. He recorded Grade 3 victories in the Mainichi Hai and the Niigata Kinen before ending his season with a win over a top-class field in the Arima Kinen. He won the Sapporo Kinen in 2019 and the American Jockey Club Cup in 2020.