Hironori Saitō is a Japanese voice actor born on December 6, 1983, in Aomori Prefecture. He is affiliated with the talent agency amuleto and was previously represented by Media Force. His blood type is A.

Saitō is known for his work in anime, where he typically voices supporting characters. One of his notable roles is Hironori Madoka in the anime television series Shirobako, which aired from 2014 to 2015. In this series, which provides a fictionalized behind-the-scenes look at the anime industry, Madoka is a member of the directing staff at the animation production company Musashino Animation, working on staging and timelines for the anime within the show. Saitō also reprised this role for the Shirobako film, which premiered in 2020.

Beyond his role in Shirobako, Saitō has built a career appearing in numerous anime series. His filmography includes a range of titles from the early 2010s to the present day. Some of these roles include Shōhei Akagi in the K: Seven Stories film series, the character Nokopara in Mushoku Tensei: Jobless Reincarnation, and roles in series such as 86 EIGHTY-SIX, The Duke of Death and His Maid, and Love Flops. He has also had parts in popular shows like Cells at Work!, Overlord, Fruits Basket, and A Certain Scientific Railgun.