Tsubasa Yonaga is a Japanese voice actor and singer affiliated with the agency Ken Production. He was born in Kanagawa Prefecture on January 15, 1984, and was raised in Ushiku, Ibaraki. His path to a career in voice acting began in elementary school when a teacher, aware of his interests in singing and performing, suggested the profession to him. He pursued this goal by joining his high school drama club and later enrolling in the voice actor vocal course at the vocational school Tokyo Media Academy. He subsequently entered the Ken Production-affiliated training school, School Duo, before officially joining the agency.

Yonaga made his voice acting debut in 2006, voicing a student in the OVA Cluster Edge Secret Episode. The following year, in 2007, he landed his first leading roles in anime, playing Shingo Suwa in Gigantic Formula and Ren Mihashi in Big Windup!. His performance as Mihashi, in particular, was a significant breakthrough, earning him the Best Rookie Actor award at the 2nd Seiyu Awards in 2008.

Throughout his career, Yonaga has become known for a wide range of characters. Some of his most prominent and long-running roles include Aichi Sendō in the Cardfight!! Vanguard series, Nagisa Hazuki in the Free! franchise, Sangaku Manami in Yowamushi Pedal, and Mitsuki Izumi in the IDOLiSH7 projects. His filmography also includes roles such as Tsutomu Komano in Chihayafuru, Izumi Sena in Love Stage!!, Teiichi Niiya in Tasogare Otome x Amnesia, and Chutaro Kumo in Donten ni Warau.

In addition to his anime work, Yonaga has contributed his voice to numerous video games. A notable example is his role as Jude Mathis in the Tales of Xillia and its sequel, Tales of Xillia 2. He has also voiced characters in games like Time Hollow, Chaos;Head, and the IDOLiSH7 mobile game.

Beyond solo performances, Yonaga has been active in music and collaborative units. In 2011, he formed the musical unit Trignal with fellow voice actors and singers Takuya Eguchi and Ryōhei Kimura. The group made their CD debut in 2012 under the Kiramune label. He also formed a unit called BRAVE WING with voice actor Yuki Kaji.

In late 2019, Yonaga publicly announced that he would be limiting some of his activities due to undergoing treatment for dysphonia, a voice disorder.