Amagatsu Ushio (天児牛大), born in Yokosuka, Kanagawa, Japan in 1949, is a Japanese choreographer known for the creation of the Butoh troupe Sankai Juku (山海塾). Amagatsu formed the internationally celebrated and innovative modern dance group in 1975. He was also co-founder of the equally seminal Butoh collective Dairakakudakan in 1972.