Keitaro Tanaka is a Japanese voice actor born on April 9th and affiliated with the talent agency Aoni Production. He is a graduate of the Osaka branch of Aoni Juku, the agency's associated training school for voice actors. Tanaka is from Hyogo Prefecture in Japan and speaks the Kansai dialect.

Tanaka made his debut in 2019, with his first credited role being as an assistant director in an episode of the long-running anime series Crayon Shin-chan. In the same year, he also began voicing minor characters in the franchise One Piece, playing roles such as a subordinate and a看守. His career progressed with numerous supporting and background roles in a wide variety of television anime, demonstrating his range by voicing diverse characters including students, townspeople, and creatures. Notable credits from this period include roles in Digimon Adventure:, My Hero Academia, and as Carlo in Attack on Titan The Final Season.

His work is not limited to television. Tanaka has lent his voice to original net animations, such as the role of Researcher B in the Pokemon: Sword and Shield web series Pokémon: Twilight Wings. He has also appeared in theatrical anime films, with credits including the 2021 films Pretty Guardian Sailor Moon Eternal The Movie and Pokémon the Movie: Secrets of the Jungle. Beyond animation, his portfolio includes voice work for video games, such as the character Asimov in Punishing: Gray Raven, and narration for various Japanese television programs. He has also participated in stage readings, including a symphonic drama production of Firebird.

Tanaka's role as a breeding farm staff member appears in a commercial for the JRA brand titled Today, My Story Will Run. This role is confirmed by his official agency profile, which lists the JRA brand campaign and the specific role of 育成牧場スタッフ, or breeding farm staff.