Masanori Saito (February 1, 1942) is a former Japanese professional wrestler better known as Mr. Saito or Masa Saito. He wrestled for several years in various promotions operated by the National Wrestling Alliance (NWA). He later joined the World Wrestling Federation (WWF), where he teamed with Mr. Fuji to hold the World Tag Team Championship twice. He also won the AWA World Heavyweight Championship in 1990. In Japan, Saito wrestled for both All Japan Pro Wrestling and New Japan Pro Wrestling. Saito gained notoriety for his arrest after throwing a boulder through the window of a McDonald's restaurant in Waukesha Wisconsin and for a match wrestled against Antonio Inoki on a deserted island in Japan.