Ken Ishizaki (died 1963) was a Japanese yakuza criminal who was affiliated with Nomoto Enterprises in Tokyo during the 1960s. In 1963, he was beaten up by former TMPD detective Joji Mizuno in a street fight, with Mizuno doing so in order to show off his skills and gain entry into the yakuza. Ishizaki later accompanied Mizuno and Goro Minami to kidnap Shigeru Takechi of the rival Sanko-gumi from his apartment, but Takechi, who discovered the kidnapping attempt, charged into the apartment and shot Ishizaki dead before Minami killed him.