Peter Tatsuo Doi was a Japanese Cardinal of the Catholic Church. He served as Archbishop of Tokyo from 1937 until his death, and was elevated to the cardinalate in 1960.

The Metropolitan Archdiocese of Tokyo is a Latin Church metropolitan archdiocese of the Catholic Church in Japan. It was erected as the Apostolic Vicariate of Japan on May 1, 1846, by Pope Gregory XVI, and its name was later changed by Pope Pius IX to the Apostolic Vicariate of Northern Japan on May 22, 1876.