Januarius Kyunosuke Hayasaka (1883-1976) was a bishop of the Catholic Church of Showa from Meiji. His baptismal name was "Yanuario".
Hayasaka was the first Japanese-ethnicity bishop. He served as the archbishop of Nagasaki between 1927 and 1937. His brother Kyube Hayasaka also served as bishop of the Diocese Daegu in Korea.