Koutarou Hashimoto is a Japanese voice actor affiliated with the agency 81 Produce. He was born in Chiba Prefecture on January 16th. His path to a voice-acting career was marked by early recognition, as he received the Special Award and the Shogakukan Award at the 6th 81 Audition. His hobbies include watching films and playing video games.

Hashimoto is best known for his role as Yuzuru Fushimi, a character he has portrayed across multiple formats in the Ensemble Stars! franchise. He first voiced the character in the 2015 mobile game, a performance he later reprised for the 2019 television anime adaptation and subsequent films. Another significant role is Tsurugi Okachimachi in the King of Prism: Shiny Seven Stars anime project, which was announced in late 2018 and released in 2019. He had previously appeared in earlier King of Prism films in minor roles.

Beyond these prominent series, Hashimoto has built a varied career with roles in other anime and games. His television anime credits include appearances in series such as MIX, Try Knights, and Gleipnir. In the realm of video games, his work includes roles in SOUL REVERSE ZERO, The White Cat Project, and the mobile game Z/X: Zillions of enemy X.