Jirō Saitō is a Japanese voice actor born on May 24, 1965, in Tochigi Prefecture, Japan. He is affiliated with the talent agency Kenyu Office. Saitō began his career in the early 2000s, providing voices for numerous supporting characters across a wide range of anime series. His early training was at the Baobab学園, and he was previously associated with Production Baobab before joining his current agency in 2011.

Saitō's career features a vast number of roles, often portraying authoritative figures, military officers, and seasoned veterans. In the 2024 series Bucchigiri?!, he voices the character Kenichiro. That same year, he was also part of the cast for the One Piece 25th-anniversary special, One Piece Fan Letter, where he played the role of the Benevolent King of the Waves. His involvement in the One Piece franchise extends to other characters as well, including Charlotte Snack and Orlumbus.

Other significant and recurring roles have defined his later career. He is well known for voicing Theo Magath in Attack on Titan: The Final Season. He also plays the elderly mage Denken in Frieren: Beyond Journey's End, the State Security Service Chief in SPY x FAMILY, and Red Riot in My Hero Academia. In the world of gaming, Saitō provided the Japanese voice for the character Otto in the critically acclaimed Final Fantasy XVI. His filmography demonstrates frequent work within major franchises and recurring collaborations with specific animation studios, leading to a body of work characterized by steady, high-quality performances in supporting roles.