1. Msgr. LEBLANC, Ambrose O.F.M. 1939-1940 (Prefect Apostolic)
2. Msgr. UCHINO, Paul Sakuzo 1941-1957
   (1941-1945 Administrator Apostolic)
   (1945-1957 Prefect Apostolic)
3. Most Rev. NAGAE, Lawrence Satoshi 1957-1979
4. Most Rev. SHIMAMOTO, Francis Xavier Kaname 1979-1990
5. Most Rev. OKADA, Peter Takeo 1991-2000

The Prefecture Apostolic of Urawa was established on January 4, 1939. It was composed of the four prefectures of Saitama, Tochigi, Gunma, and Ibaraki which were separated from the Diocese of Yokohama. It was entrusted to Canadian Franciscans, and Fr. Ambrose Leblanc, O.F.M. became the first prefect apostolic. He resigned in 1940, and Father Uchino Sakuzo was appointed the acting ordinary. In 1945 he became prefect apostolic.

Monsignor Uchino resigned in 1957, and on December 16 of the same year the Prefecture Apostolic of Urawa was raised to the status of a diocese. On December 24, 1957, Father Nagae Satoshi was appointed and consecrated the first Bishop of Urawa.

In 1979 Bishop Nagae resigned and on December 20 of the same year Father Shimamoto Kaname was appointed his successor. He was consecrated on March 20 of the following year and became Bishop of Urawa.

On March 20, 1990, Bishop Shimamoto was appointed Archbishop of Nagasaki, and took office in May. After that, Father Oka Hiroshi served as administrator of the diocese until on September 16, 1991, Father Okada Takeo was consecrated and took over as Bishop of Urawa.

On June 12, 2000, Bishop Okada became Archbishop of Tokyo. On the same day, Urawa diocesan priest Fr. Tani Daiji was appointed Bishop of Urawa. He was consecrated bishop on September 15, 2000.