Masanori Saito (斎藤 昌典, Saitō Masanori, February 1, 1942 – July 14, 2018) was a Japanese professional wrestler better known as Mr. Saito or Masa Saito (マサ斎藤), who wrestled for 33 years across the world. He had success as a singles wrestler, winning the AWA World Heavyweight Championship in 1990, and as a tag team wrestler with multiple partners in various National Wrestling Alliance (NWA) territories. Saito was imprisoned for two years in the mid-1980s for physically assaulting police officers in Waukesha, Wisconsin, following an accusation of vandalism against his friend Ken Patera.