Date | Change |
| 968 | Diocese of Poznań was established |
| 999 | Metropolitan Archdiocese of Gniezno was established (from Diocese of Poznań) |
| 1000 | Diocese of Kołobrzeg was established |
| 1000 | Diocese of Wrocław was established (from Diocese of Praha and Diocese of Meißen) |
| 1000.03.08 | Diocese of Kraków was established (from Diocese of Poznań) |
| 1015 | Diocese of Kołobrzeg was suppressed (to Metropolitan Archdiocese of Gniezno, and to establish Diocese of Kujawy–Pomorze) |
| 1015 | Diocese of Kujawy–Pomorze was established (from the suppressed Diocese of Kołobrzeg) |
| 1075 | Diocese of Płock was established |
| 1140 | Diocese of Wollin was established |
| 1148 | Diocese of Kujawy–Pomorze was renamed as Diocese of Kujawy–Pomorze |
| 1175 | Diocese of Wollin was renamed as Diocese of Kamień |
| 1243.07.23 | Diocese of Warmia was established |
| 1243.07.29 | Diocese of Chełmno was established |
| 1243.07.29 | Diocese of Pomezania was established |
| 1257.02.01 | Diocese of Łuków was established (from Diocese of Kraków) |
| 1257.08 | Diocese of Łuków was suppressed (to Diocese of Kraków) |
| 1340.04 | Diocese of Przemyśl was established |
| 1358 | Diocese of Chełm was restored |
| 1364 | Diocese of Kraków lost territory to Metropolitan Archdiocese of Gniezno |
| 1424.10.17 | Diocese of Kraków lost territory to Diocese of Chełm |
| 1426.06.21 | Diocese of Chełm lost territory to Diocese of Kraków |
| 1545 | Diocese of Kamień was suppressed |
| 1556 | Titular Episcopal See of Kamień was restored |
| 1596 | Diocese of Chełm–Bełz (Ukrainian Rite) was established |
| 1601.04.19 | Diocese of Pomezania lost territory to Diocese of Chełmno |
| 1609 | Diocese of Przemyśl (Ukrainian Rite) was established |
| 1621 | Diocese of Kraków lost territory to Diocese of Poznań |
| 1633 | Diocese of Płock lost territory to Diocese of Kujawy–Pomorze |
| 1763 | Diocese of Pomezania was suppressed (to Diocese of Chełmno) |
| 1763.07.11 | Diocese of Kraków lost territory to Diocese of Przemyśl |
| 1772 | Diocese of Chełm lost territory to Diocese of Przemyśl |
| 1786.03.13 | Diocese of Tarnów was established (from Diocese of Kraków) |
| 1788 | Diocese of Wrocław lost territory to Metropolitan Archdiocese of Olomouc |
| 1790.08.08 | Diocese of Chełm was renamed as Diocese of Chełm–Lublin (gained territory from Diocese of Kraków) |
| 1790.08.08 | Diocese of Kraków lost territory to Diocese of Chełm–Lublin |
| 1794.01.12 | Diocese of Poznań lost territory to Metropolitan Archdiocese of Gniezno |
| 1798.03.06 | Diocese of Supraśl (Ukrainian Rite) was established (from Metropolitan Archdiocese of Kyiv–Halyč and former Diocese of Volodymyr–Brėst) |
| 1798.03.25 | Diocese of Wigry was established (from Diocese of Žemaitija, Diocese of Vilnius and Diocese of Luck) |
| 1798.08.08 | Diocese of Chełm–Lublin lost territory to Diocese of Lutsk and Zytomierz |
| 1798.10.16 | Diocese of Warszawa was established (from Metropolitan Archdiocese of Gniezno) |
| 1800.09.09 | Diocese of Płock lost territory to Diocese of Warszawa |
| 1805.06.13 | Diocese of Kielce was established (from Metropolitan Archdiocese of Gniezno, Diocese of Kraków and Diocese of Chełm–Lublin) |
| 1805.06.13 | Diocese of Warszawa lost territory to Diocese of Chełm–Lublin |
| 1805.09.22 | Diocese of Chełm–Lublin was suppressed (to establish Diocese of Lublin) |
| 1805.09.22 | Diocese of Lublin was established (from the suppressed Diocese of Chełm–Lublin) |
| 1805.09.24 | Diocese of Tarnów was suppressed (to Diocese of Kraków and Diocese of Przemyśl) |
| 1809.02.14 | Diocese of Supraśl (Ukrainian Rite) was suppressed (to Diocese of Chełm–Bełz and Diocese of Volodymyr–Brėst) |
| 1818.06.30 | Metropolitan Archdiocese of Gniezno lost territory to Metropolitan Archdiocese of Warszawa |
| 1818.06.30 | Diocese of Kielce was suppressed (to establish Diocese of Sandomierz) |
| 1818.06.30 | Diocese of Kujawy–Pomorze was renamed as Diocese of Kujawy–Kaliska (lost territory to Metropolitan Archdiocese of Gniezno, Diocese of Poznań, Diocese of Wrocław and Diocese of Płock) |
| 1818.06.30 | Diocese of Lublin lost territory to Metropolitan Archdiocese of Warszawa |
| 1818.06.30 | Diocese of Podlachia was established (from Diocese of Lublin, Diocese of Poznań, Diocese of Lutsk and Zytomierz and Diocese of Płock) |
| 1818.06.30 | Diocese of Płock lost territory to Metropolitan Archdiocese of Warszawa |
| 1818.06.30 | Diocese of Sandomierz was established (from Diocese of Kraków, and from the suppressed Diocese of Kielce) |
| 1818.06.30 | Diocese of Sejny was established (from Diocese of Płock, and from the suppressed Diocese of Wigry) |
| 1818.06.30 | Diocese of Warszawa was promoted as Metropolitan Archdiocese of Warszawa (gained territory from Metropolitan Archdiocese of Gniezno, Diocese of Lublin and Diocese of Płock) |
| 1818.06.30 | Diocese of Wigry was suppressed (to establish Diocese of Sejny) |
| 1821.07.16 | Diocese of Chełmno lost territory to Diocese of Warmia |
| 1821.07.16 | Metropolitan Archdiocese of Gniezno lost territory to Diocese of Chełmno |
| 1821.07.16 | Diocese of Kraków lost territory to Diocese of Wrocław |
| 1821.07.16 | Diocese of Poznań was promoted as Metropolitan Archdiocese of Poznań (gained territory from Diocese of Wrocław) |
| 1821.07.16 | Diocese of Wrocław lost territory to Metropolitan Archdiocese of Poznań |
| 1821.09.20 | Diocese of Tyniec was restored (from Diocese of Kraków) |
| 1826.04.23 | Diocese of Tyniec was renamed as Diocese of Tarnów |
| 1875.03.18 | Diocese of Chełm–Bełz (Ukrainian Rite) was suppressed |
| 1880.01.20 | Diocese of Tarnów lost territory to Diocese of Kraków |
| 1882.12.28 | Diocese of Kielce was restored (from Diocese of Sandomierz) |
| 1886.03.27 | Diocese of Tarnów lost territory to Diocese of Kraków |
| 1919.02.05 | Military Vicariate of Poland was established |
| 1920.12.10 | Diocese of Łódź was established (from Metropolitan Archdiocese of Warszawa) |
| 1921 | Diocese of Sejny lost territory to Diocese of Žemaitija |
| 1922.04.21 | Apostolic Administration of Gdańsk was established (from Diocese of Warmia and Diocese of Chełmno) |
| 1922.11.07 | Apostolic Administration of Upper Silesia was established (from Diocese of Wrocław) |
| 1923.05.01 | Apostolic Administration of Tütz was established (from Metropolitan Archdiocese of Gniezno and Diocese of Chełmno) |
| 1925.10.28 | Diocese of Częstochowa was established (from Diocese of Łódź, Diocese of Wrocław and Diocese of Kielce) |
| 1925.10.28 | Apostolic Administration of Upper Silesia was promoted as Diocese of Katowice |
| 1925.10.28 | Diocese of Kraków was promoted as Metropolitan Archdiocese of Kraków (gained territory from Diocese of Tarnów) |
| 1925.10.28 | Diocese of Przemyśl exchanged territory with Diocese of Tarnów |
| 1925.10.28 | Diocese of Płock lost territory to Diocese of Łomża |
| 1925.10.28 | Diocese of Sejny was suppressed (to establish Diocese of Łomża) |
| 1925.10.28 | Diocese of Podlachia was renamed as Diocese of Siedlce |
| 1925.10.28 | Diocese of Tarnów lost territory to Metropolitan Archdiocese of Kraków |
| 1925.10.28 | Metropolitan Archdiocese of Warszawa lost territory to Diocese of Łomża |
| 1925.10.28 | Diocese of Kujawy–Kaliska was renamed as Diocese of Włocławek |
| 1925.10.28 | Diocese of Łomża was established (from the suppressed Diocese of Sejny, and gained territory from Metropolitan Archdiocese of Warszawa and Diocese of Płock) |
| 1925.12.30 | Apostolic Administration of Gdańsk was promoted as Diocese of Gdańsk |
| 1930.08.13 | Diocese of Chełmno lost territory to Diocese of Warmia |
| 1930.08.13 | Apostolic Administration of Tütz was promoted as Territorial Prelature of Schneidemühl |
| 1930.08.13 | Diocese of Wrocław was promoted as Metropolitan Archdiocese of Wrocław (lost territory to establish Diocese of Berlin) |
| 1934.02.10 | Apostolic Administration of Łemkowszczyzna (Ukrainian Rite) was established (from Diocese of Przemyśl) |
| 1938.11.04 | Metropolitan Archdiocese of Wrocław lost territory to Diocese of Katowice |
| 1940.01.01 | Diocese of Katowice lost territory to Metropolitan Archdiocese of Wrocław |
| 1941.02 | Apostolic Administration of Łemkowszczyzna (Ukrainian Rite) was promoted as Apostolic Exarchate of Łemkowszczyzna |
| 1945 | Diocese of Przemyśl lost territory to Metropolitan Archdiocese of Lviv |
| 1945.08.15 | Apostolic Administration of Upper Silesia was established (from Metropolitan Archdiocese of Olomouc and Metropolitan Archdiocese of Wrocław) |
| 1945.09.01 | Territorial Prelature of Schneidemühl was renamed as Territorial Prelature of Piła |
| 1947 | Military Vicariate of Poland was suppressed |
| 1972.06.28 | Diocese of Gorzów was established (from Diocese of Berlin and Metropolitan Archdiocese of Wrocław, and from the suppressed Territorial Prelature of Piła) |
| 1972.06.28 | Diocese of Koszalin–Kołobrzeg was restored (from Diocese of Berlin, and from the suppressed Territorial Prelature of Piła) |
| 1972.06.28 | Apostolic Administration of Upper Silesia was promoted as Diocese of Opole |
| 1972.06.28 | Territorial Prelature of Piła was suppressed (to establish Diocese of Koszalin–Kołobrzeg and Diocese of Gorzów) |
| 1972.06.28 | Diocese of Szczecin–Kamień was restored (from Diocese of Berlin) |
| 1978.05.31 | Metropolitan Archdiocese of Wrocław lost territory to Metropolitan Archdiocese of Olomouc |
| 1981.09.18 | Ordinariate of Poland (for Greek and Armenian Catholics) (Eastern Rite) was established (from Metropolitan Archdiocese of Warszawa) |
| 1981.10.03 | Diocese of Sandomierz was renamed as Diocese of Sandomierz–Radom |
| 1991 | Apostolic Administration of Lubaczów was established (from Metropolitan Archdiocese of Lviv) |
| 1991 | Military Ordinariate of Ordynariat Polowy Wojska Polskiego was restored |
| 1991.01.16 | Ordinariate of Poland (for Greek and Armenian Catholics) (Eastern Rite) was renamed as Ordinariate of Ordynariat dla wiernych obrządku wschodniego |
| 1991.01.16 | Apostolic Exarchate of Łemkowszczyzna (Ukrainian Rite) was suppressed (to Diocese of Przemyśl) |
| 1991.06.05 | Diocese of Białystok was established (from Metropolitan Archdiocese of Vilnius) |
| 1991.06.05 | Diocese of Drohiczyn was established (from Diocese of Pinsk) |
| 1992.03.25 | Diocese of Białystok was promoted as Metropolitan Archdiocese of Białystok |
| 1992.03.25 | Diocese of Bielsko–Żywiec was established (from Diocese of Katowice and Metropolitan Archdiocese of Kraków) |
| 1992.03.25 | Diocese of Częstochowa was promoted as Metropolitan Archdiocese of Częstochowa (lost territory to establish Diocese of Gliwice, Diocese of Kalisz and Diocese of Sosnowiec) |
| 1992.03.25 | Diocese of Elbląg was established (from Diocese of Gdańsk, Diocese of Warmia and Diocese of Chełmno) |
| 1992.03.25 | Diocese of Ełk was established (from Diocese of Warmia and Diocese of Łomża) |
| 1992.03.25 | Diocese of Gdańsk was promoted as Metropolitan Archdiocese of Gdańsk (gained territory from Diocese of Chełmno, and lost territory to establish Diocese of Elbląg) |
| 1992.03.25 | Diocese of Gliwice was established (from Diocese of Częstochowa, Diocese of Katowice and Diocese of Opole) |
| 1992.03.25 | Diocese of Kalisz was established (from Diocese of Częstochowa, Metropolitan Archdiocese of Gniezno, Metropolitan Archdiocese of Poznań, Metropolitan Archdiocese of Wrocław, Diocese of Opole and Diocese of Włocławek) |
| 1992.03.25 | Diocese of Katowice was promoted as Metropolitan Archdiocese of Katowice (lost territory to establish Diocese of Bielsko–Żywiec and Diocese of Gliwice) |
| 1992.03.25 | Diocese of Legnica was established (from Metropolitan Archdiocese of Wrocław) |
| 1992.03.25 | Diocese of Lublin was promoted as Metropolitan Archdiocese of Lublin (lost territory to Diocese of Zamość–Lubaczów, and exchanged territory with Diocese of Sandomierz–Radom) |
| 1992.03.25 | Diocese of Chełmno was renamed as Diocese of Pelplin (lost territory to Metropolitan Archdiocese of Gdańsk, Metropolitan Archdiocese of Gniezno and Diocese of Koszalin–Kołobrzeg, and lost territory to establish Diocese of Elbląg and Diocese of Toruń) |
| 1992.03.25 | Diocese of Przemyśl was promoted as Metropolitan Archdiocese of Przemyśl (lost territory to establish Diocese of Rzeszów) |
| 1992.03.25 | Diocese of Płock lost territory to Diocese of Łomża |
| 1992.03.25 | Diocese of Radom was established (from Diocese of Sandomierz–Radom) |
| 1992.03.25 | Diocese of Rzeszów was established (from Diocese of Przemyśl and Diocese of Tarnów) |
| 1992.03.25 | Diocese of Sandomierz–Radom was renamed as Diocese of Sandomierz (lost territory to establish Diocese of Radom, and exchanged territory with Diocese of Lublin) |
| 1992.03.25 | Diocese of Sosnowiec was established (from Diocese of Częstochowa, Metropolitan Archdiocese of Kraków and Diocese of Kielce) |
| 1992.03.25 | Diocese of Szczecin–Kamień was promoted as Metropolitan Archdiocese of Szczecin–Kamień |
| 1992.03.25 | Diocese of Toruń was established (from Metropolitan Archdiocese of Gniezno and Diocese of Chełmno) |
| 1992.03.25 | Diocese of Warmia was promoted as Metropolitan Archdiocese of Warmia (lost territory to Apostolic Administration of European Russia, and lost territory to establish Diocese of Elbląg and Diocese of Ełk) |
| 1992.03.25 | Diocese of Warszawa-Praga was established (from Metropolitan Archdiocese of Warszawa and Diocese of Płock) |
| 1992.03.25 | Apostolic Administration of Lubaczów was promoted as Diocese of Zamość–Lubaczów (gained territory from Diocese of Lublin) |
| 1992.03.25 | Diocese of Gorzów was renamed as Diocese of Zielona Góra–Gorzów |
| 1992.03.25 | Diocese of Łowicz was established (from Diocese of Łódź, Metropolitan Archdiocese of Warszawa and Diocese of Płock) |
| 1992.03.25 | Diocese of Łódź was promoted as Archdiocese of Łódź (lost territory to establish Diocese of Łowicz) |
| 1996.05.24 | Diocese of Przemyśl (Ukrainian Rite) was promoted as Metropolitan Archdiocese of Przemyśl–Warszawa |
| 1996.06.01 | Diocese of Wrocław–Gdańsk (Ukrainian Rite) was established (from Metropolitan Archdiocese of Przemyśl–Warszawa) |
| 2004.02.24 | Diocese of Bydgoszcz was established (from Metropolitan Archdiocese of Gniezno, Diocese of Koszalin–Kołobrzeg and Diocese of Pelplin) |
| 2004.02.24 | Archdiocese of Łódź was promoted as Metropolitan Archdiocese of Łódź |
| 2004.02.24 | Diocese of Świdnica was established (from Metropolitan Archdiocese of Wrocław and Diocese of Legnica) |
| 2009.01 | Titular Episcopal See of Chełm was restored |
| 2009.01 | Titular Episcopal See of Sejny was restored |
| 2014.10 | Titular Episcopal See of Pomezania was restored |
| 2014.10 | Titular Episcopal See of Wigry was restored |
| 2020.11.25 | Diocese of Olsztyn–Gdańsk (Ukrainian Rite) was established (from Metropolitan Archdiocese of Przemyśl–Warszawa and Diocese of Wrocław–Gdańsk) |
| 2020.11.25 | Diocese of Wrocław–Gdańsk (Ukrainian Rite) was renamed as Diocese of Wrocław–Koszalin (lost territory to establish Diocese of Olsztyn–Gdańsk) |
