佐藤流司 is a Japanese actor and singer who began his career in live-action television and stage productions before expanding into anime voice acting. He was born on January 17, 1995, in Miyagi Prefecture and is affiliated with the theatre company Gekidan Himawari. His career began in 2011 with a role in the television series Kamen Rider Fourze.

He is prominently known for his extensive work in stage adaptations of anime and manga, a genre often referred to as 2.5D musicals. His most notable stage roles include playing Sasuke Uchiha in Live Spectacle Naruto and portraying the sword warrior Kiyomitsu Kashu in the Musical Touken Ranbu series. His physical skills, which include karate, drumming, acrobatics, and dance, are frequently utilized in these demanding performance roles.

In addition to his stage work, Sato is also a musician. He leads a band project called The Brow Beat under the name Ryuji and is a member of the musical performance unit ZIPANG OPERA.

His entry into anime voice acting was marked by a single, specific role. He was cast as Lucio Cortes in the 2022 anime series Rusted Armors -Dawn-. This character is described as a冷酷非情な異国から来た侵略者, meaning a cold-hearted invader from a foreign land, who was created as an original character for the anime adaptation. Sato himself confirmed that this role marked his voice acting debut, stating in an interview, 声のお芝居初挑戦です, which translates to "This is my first challenge with voice acting". He has no other documented major roles in anime voice acting.