Kazuo Oka was a Japanese voice actor and actor from Saitama Prefecture, born on January 15, 1948. He was active in the industry from the mid-1980s until his passing on April 29, 2021, and was affiliated with the talent management firm Arts Vision throughout his later career.

Oka's career was characterized by a wide range of supporting and guest roles in numerous anime television series, original video animations, and films. He was frequently cast in roles for older, authoritative, or background characters, contributing his voice to many long-running and popular franchises. His early work included roles in the Gundam franchise, such as Raymond Bishop in Mobile Fighter G Gundam. He also had a recurring presence in the long-running series Soreike! Anpanman, Ninja Nonsense, and Crayon Shin-chan. Oka was a frequent contributor to the Detective Conan universe, voicing numerous minor characters and police officers across multiple episodes and a theatrical film.

Among his notable roles are the ones the user inquired about. He voiced the character Globus in the 1987 anime series Seimei no Kagaku Micro Patrol. He is also credited as the voice of Kenzou Sakiyama in the Kimi ga Nozomu Eien franchise, appearing in both the 2003 television series and the 2007 original video animation Kimi ga Nozomu Eien ~Next Season~. Furthermore, he took on the role of Zaggy in the 1992 OVA Dragon Slayer: The Legend of Heroes. Other significant performances include the first voice of Buffaloman and Robin Knight in Kinnikuman: Scramble for the Throne, Storm Owl and Frost Walrus in the video game Mega Man X4, and Klaus von Lichtenlade in the 2018 series Legend of the Galactic Heroes: Die Neue These. His later work also included roles in March Comes in like a Lion and Tsukigakirei.

Kazuo Oka's career spanned over three decades, during which he built a substantial body of work as a reliable character actor, leaving a lasting impression on the anime industry through his extensive and versatile voice performances.