Isao Tamagawa (玉川 伊佐男, January 11, 1922 – January 1, 2004) was a Japanese actor. He appeared in the Japanese film Branded to Kill, as Michihiko Yabuhara: the yakuza boss that hires Hanada and seduces his wife. Upon the discovery that his diamond smuggling operation has been burgled, he employs Hanada to execute the guilty parties then adds him to the list when he flubs the job. His final appearance is with a bullet hole in his head.

Tamagawa is also known for his role as the bumbling, but skilled Inspector Ippei Kumano in Super Robot Red Baron, which ran from 1973 to 1974.

On January 1, 2004, Tamagawa died at the age of 79, just ten days before his eightieth birthday. He was a native of Tokyo.