Shirō Saitō(斎藤 志郎Saitō Shirō) (August 31, 1956 - ) is a Japanese actor and seiyū from Sakata, Yamagata attached to Bungakuza. He is a graduate of Yamagata Prefectural Sakata Technical High School and the law course of Toyo University. After graduation, he worked in the Civil Division of Tokyo's city hall for six-and-a-half years before retiring to become an actor. He often voices villainous or non-human roles in animation, such as Mamezō in Kekkaishi or Vilgax in Ben 10. He was the leader of a gang in his high school years and is a friend of Dharma & Greg co-star Sakiko Uran.