A Certain Killer is a 1967 Japanese crime suspense film directed by Kazuo Mori. Its screenplay was written by Yasuzo Masumura and Yoshihiro Ishimatsu. The film stars Raizō Ichikawa. It was adapted from the novel Zenya written by Shinji Fujiwara. A sequel, Aru Koroshiya no Kage, was released in the same year.