Tsubasa Sasa is a Japanese voice actor and stage actor born on September 12, 1995, in Chiba Prefecture, Japan. He is affiliated with the talent agency atomicmonkey. Early in his career, he performed under the name Ryuuto Tsubasa before switching to his current stage name.

His career began in 2014 with a debut in the stage play歌舞伎の王子様, where he played the role of Ryota Ueno. For a significant period, his work was centered on stage performances. A major part of his early career was his long-running portrayal of Iku Kannaduki in the ツキウタ。 stage play series, a role he reprised in multiple productions over several years, including the fifth stage play Rabbits Kingdom and the new work 月歌奇談 夢見草 櫻之章. He transitioned into voice acting in 2015 with a role in the drama CD ハンサム落語〜朧語り〜. His first work in TV animation came in 2019 with a small role in the series 消滅都市.

In addition to his work in animation and on stage, Sasa has also lent his voice to video games and participated in narrative readings. His film credits include a role as Yūichi Shiratori in the 2020 live-action film 縁侧ラヴァーズ.

Sasa is known for his involvement in the VAZZROCK media mix project. As part of this project, he voices the character Naosuke Ōyama, a role he has played since 2017. This character appears in the 2022 anime adaptation VazzRock the Animation, as well as in related music and content. His other notable anime roles from the early 2020s include parts in The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You and Failure Frame: I Became the Strongest and Annihilated Everything with Low-Level Spells.