| 1588.02.19 |
Diocese of Funai 府内 was established (from Diocese of Macau 澳門 and became suffragan of Goa) |
| 1660 |
Diocese of Funai 府内 was suppressed |
| 1846.05.01 |
Apostolic Vicariate of Japan 日本 was established (from Apostolic Vicariate of Korea 조선) |
| 1876.05.22 |
Apostolic Vicariate of Japan 日本 was suppressed (to establish Apostolic Vicariate of Northern Japan 日本北緯 and Apostolic Vicariate of Southern Japan 日本南緯) |
| 1876.05.22 |
Apostolic Vicariate of Northern Japan 日本北緯 was established (from the suppressed Apostolic Vicariate of Japan 日本) |
| 1876.05.22 |
Apostolic Vicariate of Southern Japan 日本南緯 was established (from the suppressed Apostolic Vicariate of Japan 日本) |
| 1888.03.20 |
Apostolic Vicariate of Central Japan 日本中部 was established (from Apostolic Vicariate of Southern Japan 日本南緯) |
| 1891.04.17 |
Apostolic Prefecture of Hakodate 函館 was established (from Apostolic Vicariate of Northern Japan 日本北緯) |
| 1891.06.15 |
Apostolic Prefecture of Hakodate 函館 was promoted as Diocese of Hakodate 函館 (became suffragan of Tokyo 東京) |
| 1891.06.15 |
Apostolic Vicariate of Southern Japan 日本南緯 was promoted as Diocese of Nagasaki 長崎 (became suffragan of Tokyo 東京) |
| 1891.06.15 |
Apostolic Vicariate of Central Japan 日本中部 was promoted as Diocese of Osaka 大阪 (became suffragan of Tokyo 東京) |
| 1891.06.15 |
Apostolic Vicariate of Northern Japan 日本北緯 was promoted as Metropolitan Archdiocese of Tokyo 東京 (with suffragan sees Hakodate 函館, Nagasaki 長崎 and Osaka 大阪) |
| 1904.01.27 |
Apostolic Prefecture of Shikoku 四国 was established (from Diocese of Osaka 大阪 and became suffragan of Tokyo 東京) |
| 1912.08.13 |
Apostolic Prefecture of Niigata 新潟 was established (from Metropolitan Archdiocese of Tokyo 東京, Diocese of Hakodate 函館 and Diocese of Osaka 大阪 and became suffragan of Tokyo 東京) |
| 1915.02.12 |
Apostolic Prefecture of Sapporo 札幌 was established (from Diocese of Hakodate 函館 and became suffragan of Tokyo 東京) |
| 1922.02.18 |
Apostolic Prefecture of Nagoya 名古屋 was established (from Metropolitan Archdiocese of Tokyo 東京 and Apostolic Prefecture of Niigata 新潟 and became suffragan of Tokyo 東京) |
| 1923.05.04 |
Apostolic Vicariate of Hiroshima 広島 was established (from Diocese of Osaka 大阪 and became suffragan of Tokyo 東京) |
| 1927.03.18 |
Apostolic Prefecture of Kagoshima 鹿児島 was established (from Diocese of Nagasaki 長崎 and became suffragan of Tokyo 東京) |
| 1927.07.16 |
Diocese of Fukuoka 福岡 was established (from Diocese of Nagasaki 長崎 and became suffragan of Tokyo 東京) |
| 1928.03.27 |
Mission sui juris of Miyazaki 宮崎 was restored (from Apostolic Prefecture of Kagoshima 鹿児島 and became suffragan of Tokyo 東京) |
| 1929.03.30 |
Apostolic Prefecture of Sapporo 札幌 was promoted as Apostolic Vicariate of Sapporo 札幌 |
| 1935.01.28 |
Mission sui juris of Miyazaki 宮崎 was promoted as Apostolic Prefecture of Miyazaki 宮崎 |
| 1936.03.09 |
Diocese of Hakodate 函館 was renamed as Diocese of Sendai 仙台 |
| 1937.06.17 |
Apostolic Prefecture of Kyoto 京都 was established (from Diocese of Osaka 大阪 and became suffragan of Tokyo 東京) |
| 1937.11.09 |
Diocese of Yokohama 横浜 was restored (from Metropolitan Archdiocese of Tokyo 東京 and became suffragan of Tokyo 東京) |
| 1939.01.04 |
Apostolic Prefecture of Urawa 浦和 was established (from Diocese of Yokohama 横浜 and became suffragan of Tokyo 東京) |
| 1947.01.13 |
Apostolic Administration of Okinawa and the Southern Islands 琉球列島 was established (from Apostolic Prefecture of Kagoshima 鹿児島 and became suffragan of Tokyo 東京) |
| 1951.07.12 |
Apostolic Prefecture of Kyoto 京都 was promoted as Diocese of Kyoto 京都 |
| 1952.02.28 |
Apostolic Administration of Okinawa and the Southern Islands 琉球列島 lost territory to Apostolic Prefecture of Kagoshima 鹿児島 |
| 1952.12.11 |
Apostolic Vicariate of Sapporo 札幌 was promoted as Diocese of Sapporo 札幌 (gained territory from Diocese of Sendai 仙台) |
| 1952.12.11 |
Diocese of Sendai 仙台 lost territory to Diocese of Sapporo 札幌 |
| 1955.02.25 |
Apostolic Prefecture of Kagoshima 鹿児島 was promoted as Diocese of Kagoshima 鹿児島 |
| 1957.12.16 |
Apostolic Prefecture of Urawa 浦和 was promoted as Diocese of Urawa 浦和 |
| 1959.05.04 |
Diocese of Nagasaki 長崎 was promoted as Metropolitan Archdiocese of Nagasaki 長崎 (with suffragan sees Fukuoka 福岡, Kagoshima 鹿児島, Miyazaki 宮崎 and Okinawa and the Southern Islands 琉球列島) |
| 1959.06.30 |
Apostolic Vicariate of Hiroshima 広島 was promoted as Diocese of Hiroshima 広島 |
| 1961.12.22 |
Apostolic Prefecture of Miyazaki 宮崎 was promoted as Diocese of Oita 大分 |
| 1962.04.16 |
Apostolic Prefecture of Nagoya 名古屋 was promoted as Diocese of Nagoya 名古屋 |
| 1962.04.16 |
Apostolic Prefecture of Niigata 新潟 was promoted as Diocese of Niigata 新潟 |
| 1963.09.13 |
Apostolic Prefecture of Shikoku 四国 was promoted as Diocese of Takamatsu 高松 |
| 1969.06.24 |
Diocese of Osaka 大阪 was promoted as Metropolitan Archdiocese of Osaka 大阪 (with suffragan sees Hiroshima 広島, Kyoto 京都, Nagoya 名古屋 and Takamatsu 高松) |
| 1972.12.18 |
Apostolic Administration of Okinawa and the Southern Islands 琉球列島 was promoted as Diocese of Naha 那覇 |
| 2003.03.31 |
Diocese of Urawa 浦和 was renamed as Diocese of Saitama さいたま |
| 2012.06.15 |
Personal Ordinariate of Our Lady of the Southern Cross (Anglican Rite) was established |
| 2023.08.15 |
Metropolitan Archdiocese of Osaka 大阪 was renamed as Metropolitan Archdiocese of Osaka–Takamatsu 大阪高松 (gained territory from the suppressed Diocese of Takamatsu 高松 and lost suffragan see Takamatsu 高松) |
| 2023.08.15 |
Diocese of Takamatsu 高松 was suppressed (to Metropolitan Archdiocese of Osaka–Takamatsu 大阪高松) |
