Renji Ishibashi is a Japanese actor whose primary career has been in live-action film and television, with a very limited number of credits in anime voice acting. He was born Renji Ishida on August 9, 1941, in Shinagawa, Tokyo. His career began in the 1960s, and he has since become a highly respected figure in Japanese cinema, often recognized for his roles in gangster films, though he has also portrayed a wide range of characters including detectives, comedic figures, and historical figures. He has received critical acclaim for his work, winning the award for best supporting actor at the 15th Hochi Film Award for his role in the film Ronin-gai. Beyond his on-screen performances, Ishibashi has a strong foundation in theater, having performed in several groups and eventually running his own troupe, Gekidan Dainana Byoto.

Within the realm of anime, Ishibashi's voice acting appearances are sparse but notable. His first role in the medium was providing the Japanese voice for the character Rengie in the 2001 film Cowboy Bebop: Knockin' on Heaven's Door. A significant, though infrequent, foray into anime voice work is his role as the Narration for the original animation video Red Colored Elegy. Outside of anime, his voice can be heard in the Japanese versions of video games, such as his role in Yakuza: Dead Souls.

His extensive filmography shows a long history of collaborations with prominent directors and actors in live-action, but he does not have recurring voice acting collaborations specific to the anime industry. His notable achievements are overwhelmingly centered on his live-action career, where he has built a legacy over several decades with performances in acclaimed films like Tetsuo: The Iron Man, Audition, Dead or Alive, and Outrage. His voice acting work remains a very small, though recognized, part of his broader and distinguished career as a Japanese actor.