Isao Tamagawa was a Japanese actor whose career included significant voice work in anime and tokusatsu productions. He was born on January 11, 1922, in the Shinjuku district of Tokyo, Japan, and passed away on January 1, 2004, at the age of 81.

Tamagawa began his on-screen acting career in the mid-1950s and became a familiar presence in Japanese cinema throughout the 1960s and 1970s. He appeared in numerous acclaimed live-action films, often in supporting roles. His notable live-action filmography includes Kwaidan from 1964, Tokyo Drifter from 1966, Fighting Elegy from 1966, Branded to Kill from 1967, and Japan's Longest Day also from 1967. He was a frequent collaborator with director Seijun Suzuki, appearing in five of Suzuki's films, including Branded to Kill, Fighting Elegy, and Tokyo Drifter.

In the realm of voice acting for animation, Tamagawa is known for his role as Detective Geta in the 1977 anime film The Visitor in the Eye, which is part of the Black Jack series based on the manga by Osamu Tezuka. He is also recognized for his performance as Inspector Ippei Kumano in the live-action tokusatsu series Super Robot Red Baron, which aired for 39 episodes from 1973 to 1974. In this series, his character was a skilled investigator, and his performance remains one of his most recognized roles in genre television. Another of his prominent voice roles was as Michihiko Yabuhara in the 1967 film Branded to Kill.

His other film credits from the later years of his career include Zigeunerweisen from 1980, Port Arthur from 1980, and Kagero-za from 1981, which was his final film role. Throughout his career spanning over three decades, Tamagawa built a substantial body of work as a character actor in both live-action and animated productions.