Seiichi Endo (遠藤誠一, Endō Seiichi, 5 June 1960 – 6 July 2018) was an Aum Shinrikyo member who was executed for his participation in the 1995 Tokyo subway sarin attack and a number of other crimes. He was the man who produced the Sarin gas for the attack after leader Shoko Asahara told him to do so.