Takahiro Shiraishi (白石隆浩, Shiraishi Takahiro; 9 October 1990 – 27 June 2025) was a Japanese serial killer and rapist. He was also known as the "Twitter killer", which he was labeled as in most media reports at the time of his sentencing. In Zama, Japan, between August and October 2017, he murdered nine people, eight of them being young women, including three high school girls.