Masahito Kawanago is a Japanese voice actor and actor born on June 17, 1972, in Saitama Prefecture, Japan. He is currently affiliated with the talent agency Production Ace. His career in the entertainment industry began in the early 1990s, and he has built a substantial body of work across television anime, original video animations, and video games.

Kawanago's professional journey includes training at a映像学院 (Eizō Gakuen), a film or影像 school. Over the years, he has been associated with several different talent agencies, having been a member of both Nine Production and Aksent before joining his current agency, Production Ace.

His voice acting career encompasses a wide variety of supporting and guest roles in numerous popular anime series. Among his notable television anime credits are roles such as Gaston in the 1997 adaptation of Berserk, a character named Kato in the special Chiisai Sensuikan ni Koi o Shita Dekasugiru Kujira no Hanashi, Byakko in Inuyasha, and Yukihito Yashiro in Skip Beat!. He has also had a recurring presence in long-running series, providing voices for various characters in Nintama Rantaro, Crayon Shin-chan, Doraemon, and multiple episodes of Detective Conan. In the OVA Demon Prince Enma, he voiced the character Oyamada, a role that appears across multiple episodes of the series. Another of his credited roles is Hira-kun in the television series Mahō Shokudō Charapontan.

In addition to his work in animation, Kawanago has contributed his voice to video games. His game credits include roles in titles such as Star Ocean: Till the End of Time, Tales of Destiny, and the Japanese version of Assassin's Creed: Unity.

Information regarding specific recurring collaborations with particular directors or other voice actors, as well as formal awards or major career achievements, is not readily available in standard career profiles. His career is primarily defined by his extensive and consistent work as a character actor in the anime industry since the mid-1990s.