Yūdai Satō is a Japanese voice actor born on October 23, 1982, in Kanagawa Prefecture, Japan. He stands 170 centimeters tall and has blood type A. Satō has been active in the voice acting industry since 2005 and is affiliated with the agency Bell Production.

Satō possesses a young, sweet vocal quality. His career has centered on work in television animation and foreign film dubbing. He is a graduate of the Amusement Media General Academy.

Among Satō's most recognized television anime roles is Kazutoshi Oki in the series Big Windup! and its sequel Big Windup! Season 2. He also voiced Hiroki Komachi in Chu-Bra!: Panty Appreciation Society. In 2007, he played Yuya Habaragi in Dragonaut: The Resonance. His other anime credits include roles in Hell Girl, where he voiced Yashiro Yatsukami and a teacher in two installments of the series, as well as parts in Over Drive, Blue Drop, and The Law of Ueki.

In the 2010s, Satō voiced the character Mamoru Uchuu in Student Council's Discretion Lv. 2. He also appeared as Rajikku in Cardfight!! Vanguard: Asia Circuit and as Aruba Kokoderu in B-Daman Crossfire. Early in his career, he had a role in the series Akagi.

Beyond animation, Satō has worked extensively on video games. He voiced Selldick, Anthem, and Elma in The False Ronde, and Kazutoshi Oki in the Big Windup! video game adaptation. His other game credits include roles in Princess Maker 5, Professor Layton and the Last Time Travel, and Steal Princess. He also contributed to drama CDs, including the Re: Bakatest series and various BLCD titles. Satō's live-action dubbing work includes the Korean drama version of Dragon Zakura and a role in Harry Potter and the Goblet of Fire.

One of his earliest OVA appearances was in Puni Puni Poemy 2 in 2007. Several official online profiles for Satō are no longer accessible, though archived versions confirm his previous affiliation with the agency Mausu Promotion before his move to Bell Production.