Masato Kokubun is a Japanese voice actor affiliated with the agency Arts Vision. He is from Chiba Prefecture and his birthday is May 2nd. He is a graduate of the Japan Narration Acting Institute.

Kokubun has provided voices for numerous characters in television anime series. Some of his credits include roles in Space Battleship Yamato 2199, Detective Conan, Medaka Box, Angel Beats!, and Starry Sky. He also appeared in The Legend of the Legendary Heroes, Togainu no Chi, and Hakuōki.

In the Space Battleship Yamato series, he is known for the role of Yoshikazu Aihara. He voiced this character in the television anime Space Battleship Yamato 2199, its sequel Space Battleship Yamato 2202: Warriors of Love, and the film Space Battleship Yamato 2199: Hoshi-Meguru Hakobune.

His work in video games includes providing character voices for titles such as Dynasty Warriors 8 Empires, where he is credited as the voice for the "Hot-blooded 3" and "Leader 3" custom male voice options. Other game credits include Shin Megami Tensei: Deep Strange Journey, Mobile Suit Gundam: Battlefield Record, and Ken to Mahō to Gakuen Mono. 2G.

Beyond anime and games, his voice acting career encompasses a wide range of work in foreign language dubbing for television dramas and films. He has provided Japanese voices for characters in productions such as the Korean drama The Lawyers of Korea, the television series Sam & Cat, iCarly, and Young Superman, as well as films like The Fighter and the miniseries The Pacific. He has also performed narration for radio commercials, including those for Yellow Hat, and for audio guides at museums and for films. Additionally, he has narrated audiobooks for novelizations of Doraemon films and other literary works.