Biichi Sato is a Japanese voice actor and stage actor known for his versatile work across anime, video games, and international dubbing. He was born on September 22, 1977, in Kanagawa Prefecture, Japan. Sato stands 182 centimeters tall, and his physical presence has contributed to his stage performances as well as his voice work.

Sato began his voice acting career in the mid-2000s, with some of his earliest credited anime roles appearing in 2006. His first known role was in the series Kekkaishi, where he voiced minor characters including a relative of Yomi and a delinquent. The following year, he took on roles in Hero Tales as Lan Yang and a Blue Dragon Group member, as well as a part in Ghost Hound. His career gained momentum in 2008 when he voiced Jack Smith in the mecha series Linebarrels of Iron, a role that appears in all 24 episodes of the show. That same year, he also had a small role as a branch chief in Mobile Suit Gundam 00 2nd season and a commander in Ga-Rei-Zero.

One of Sato's most significant recurring roles is Heymans Breda in Fullmetal Alchemist: Brotherhood, which aired from 2009 to 2010. He voiced this character, a military officer and trusted subordinate of Maes Hughes, across thirteen episodes of the series. He later reprised the role of Breda for the 2011 theatrical film Fullmetal Alchemist: The Sacred Star of Milos. In the sports anime Kuroko's Basketball, Sato provided the voice for Shinsuke Kimura, a regular character appearing across multiple seasons from 2012 through 2015.

Sato has also appeared in the long-running detective series Case Closed, known in Japan as Detective Conan, where he has voiced various guest characters including a police officer in 2008, Noriaki Nawa in 2012, Noboru Takatoge in 2013, Yasunobu Kotani in 2015, and Tsunenori Harashima in 2018. He also voiced a public security police officer in the 2016 theatrical film Detective Conan: The Darkest Nightmare. Regarding the specific role of Director Maso in Duel Masters King, this character appears in the franchise; Sato voiced Trout Department Manager and other characters in Duel Masters King! in 2021. The role of Inochicchi in Milky Panic twelve could not be verified in the available information.

Beyond anime, Sato has performed voice work for video games. He is the Japanese voice of Gadot in Final Fantasy XIII and provided the voice for Banchou Gouzou in Phoenix Wright: Ace Attorney - Dual Destinies in 2013. He has also dubbed foreign films and television series into Japanese, providing voices for Hollywood actors such as Ken Leung as Miles Straume in Lost, Mike Peterson as Deathlok in Marvel's Agents of S.H.I.E.L.D., and characters in animated productions like Ultimate Spider-Man and The Bad Guys.

Sato was affiliated with the agency Office PAC for many years. After Office PAC ceased operations on April 1, 2025, he transferred to the agency Apt Pro. He maintains an active presence on social media, where he has shared his interest in playing mahjong as a hobby.