Masao Kato (加藤 正夫, "Katō Masao", March 15, 1947 – December 30, 2004), also known as Kato Kensei (加藤剱正 "Katō Kensei"), was a Japanese professional go player at Nihon Ki-in and former president of the International Go Federation. He won 46 titles, including the Oza (王座, King) eight times in a row. He also became the 2nd player to reach 1,200 career wins.