Tatsuya Oishi (Japanese: 尾石 達也, Hepburn: Oishi Tatsuya, born March 28, 1970) is a Japanese director, animator, and storyboard artist. Oishi began his career at Studio Junio as an animator, but gained fame for his work with fellow directors Akiyuki Shinbo and Shin Oonuma at studio Shaft, where he directed the Bakemonogatari television series and its prequel film trilogy Kizumonogatari. ()