The Roman Catholic Diocese of Sapporo is a diocese belonging to the Roman Catholic church, under the Papal Primacy of Pope Francis, which is located in Sapporo, Japan. The diocese was formerly established as the Apostolic Prefecture of Sapporo on February 12, 1915. It was later lifted to the title of Apostolic Vicariate of Sapporo on March 30, 1929. Twenty-three years later, it was lifted to its current state, the Diocese of Sapporo, on December 11, 1952. This diocese under the Archdiocese of Tokyo, which is the Metropolitan territory governing the Diocese of Sapporo and other Diocesan territories, led by its Archbishop Tarcisio Isao Kikuchi.