Hiroyuki Satou is the former stage name of Yuki Sato, a Japanese voice actor born on January 26, 1962, in Kanagawa Prefecture, Japan. He is affiliated with the talent management firm Aoni Production. Sato is a graduate of Tokai University and has been active in the voice acting industry since 1986.

His career began in the late 1980s, and he became known for a wide range of roles in anime, video games, and overseas dubbing. He is credited under his former name, Hiroyuki Satō, for many of his early and most prominent roles. As Hiroyuki Satou, he had multiple roles in the 1989 anime Transformers: Victory, providing the voices for the Autobots Drillhorn and Machtackle, as well as the Decepticon Gairyū. His work in the Transformers franchise extended to other series in the continuity, including Transformers: The Headmasters and Transformers: Super-God Masterforce.

Beyond Transformers, Sato's filmography is extensive and varied. He is well-recognized for his long-running role as Motoki Furuhata, the kind manager of the arcade, in the original Sailor Moon anime series. He also voiced Sanders in the legendary OVA series Legend of the Galactic Heroes and Kane Song in the film Mobile Suit Gundam F91. In the video game world, he voiced Alba Meira in the KOF: Maximum Impact series.

Sato also built a substantial career in Japanese dubbing of foreign productions. He is particularly noted for his work on the long-running children's series Thomas & Friends, where for several seasons he voiced multiple characters, including the twin engine Donald, the diesel engine 'Arry, and the helicopter Harold. Another significant live-action dubbing role was providing the voice of the titular hero in the Ultra Series, Ultraman Cosmos.

Throughout his career, Sato has demonstrated a consistent presence in the industry, taking on both leading and supporting roles across a wide variety of genres. His affiliation with Aoni Production has been a constant throughout his professional life.