Yasutaka Tsutsui (筒井 康隆, Tsutsui Yasutaka; born September 24, 1934 in Osaka) is a Japanese novelist, science fiction author, and actor. Along with Shinichi Hoshi and Sakyo Komatsu, he is one of the most famous science fiction writers in Japan. His novel Yumenokizaka bunkiten won the Tanizaki Prize in 1987. He has also won the 1981 Izumi Kyoka award, the 1989 Kawabata Yasunari award, and the 1992 Nihon SF Taisho Award.

In 1997, he was decorated as a Chevalier Ordre des Arts et des Lettres by the French government. His work is known for its dark humour and satirical content. He has often satirized Japanese taboos such as disabilities and the Tenno system, and has been subject to criticism as a result. From 1993 to 1996, he went on a writing-strike to protest excessive, self-imposed restraint on artistic expression in Japan.