Date | Country | Change |
| 1701 |  Lebanon | Diocese of Baalbek (Greek-Melkite Rite) was established (without ecclesiastical province) |
| 1702 | Lebanon | Patriarchal See of Antioch (Syriac Rite) was suppressed |
| 1702 |  Ukraine | Diocese of Lutsk–Ostroh (Ukrainian Rite) was restored |
| 1703 |  Albania | Diocese of Pult lost territory to Diocese of Sapë |
| 1708 |  Turkiye | Archdiocese of Mardin (Armenian Rite) was established |
| 1709 |  Iran | Diocese of Salmas (Chaldean Rite) was established |
| 1709.03.13 |  India | Apostolic Vicariate of Malabar was renamed as Apostolic Vicariate of Verapoly |
| 1709.04.06 |  Germany | Apostolic Vicariate of Nordens was established (from Apostolic Vicariate of Nordic Missions) |
| 1710 |  Syria | Diocese of Aleppo (Armenian Rite) was established (without ecclesiastical province) |
| 1711 |  Greece | Titular Episcopal See of Abdera was established |
| 1712 |  China | Apostolic Vicariate of Shaanxi 陝西 was renamed as Apostolic Vicariate of Shaanxi and Shanxi 陝西山西 (gained territory from the suppressed Apostolic Vicariate of Shanxi 山西) |
| 1712 | China | Apostolic Vicariate of Shanxi 山西 was suppressed (to Apostolic Vicariate of Shaanxi and Shanxi 陝西山西) |
| 1712 |  Réunion | Apostolic Prefecture of Islands of the Indian Ocean was established (from Diocese of Malacca) |
| 1714 | Lebanon | Diocese of Beirut (Greek-Melkite Rite) was established |
| 1715 | China | Apostolic Vicariate of Guizhou 貴州 was suppressed (to Apostolic Vicariate of Szechwan 四川) |
| 1716 |  Angola | Diocese of São Paulo de Loanda was renamed as Diocese of São Paulo de Loanda |
| 1716.11.07 |  Portugal | Metropolitan Archdiocese of Lisboa was promoted as Patriarchal See of Lisboa Ocidental (lost territory to establish Metropolitan Archdiocese of Lisboa Oriental and lost suffragan sees Guarda, Portalegre and Santiago de Cabo Verde) |
| 1716.11.07 | Portugal | Metropolitan Archdiocese of Lisboa Oriental was established (from Metropolitan Archdiocese of Lisboa and with suffragan sees Guarda, Portalegre and Santiago de Cabo Verde) |
| 1717.08.13 |  Italy | Abbacy nullius of Santissima Trinità di Mileto was suppressed (to Diocese of Mileto) |
| 1718.05.10 |  Ireland | Diocese of Emly was suppressed (to Metropolitan Archdiocese of Cashel and united to Metropolitan Archdiocese of Cashel) |
| 1720 |  Kosovo | Diocese of Prizren was suppressed (to Metropolitan Archdiocese of Skopje) |
| 1720.03.04 |  Brazil | Diocese of Belém do Pará was established (from Diocese of São Luís do Maranhão and became suffragan of Lisboa Ocidental) |
| 1721.05.18 |  Romania | Diocese of Alba Iulia (Romanian Rite) was renamed as Diocese of Făgăraş |
| 1722.06.01 |  Austria | Diocese of Wien was promoted as Metropolitan Archdiocese of Wien |
| 1724 | Lebanon | Diocese of Bāniyās (Greek-Melkite Rite) was established (became suffragan of Tyr) |
| 1724 | Lebanon | Diocese of Zahleh–Furzol (Greek-Melkite Rite) was established (became suffragan of Damascus) |
| 1724.10.01 | Lebanon | Diocese of Gibail (Greek-Melkite Rite) was established |
| 1724.10.01 | Syria | Patriarchal See of Antioch (Greek-Melkite Rite) was established |
| 1725.06.23 | Italy | Diocese of Pontecorvo was established (from Diocese of Aquino and without ecclesiastical province) |
| 1725.08.19 | Italy | Diocese of Cingoli was restored (from Diocese of Osimo) |
| 1726.09.11 | Italy | Diocese of Lucca was promoted as Archdiocese of Lucca |
| 1727 | Italy | Diocese of San Miniato lost territory to Diocese of Pescia |
| 1727 | Syria | Archdiocese of Hama (Greek-Melkite Rite) was established |
| 1727 | Syria | Diocese of Homs (Greek-Melkite Rite) was established |
| 1727.02 |  Netherlands | Apostolic Vicariate of Batavia was demoted as Mission sui juris of Batavia |
| 1727.03.17 | Italy | Archdiocese of Lucca lost territory to Diocese of Pescia |
| 1727.03.17 | Italy | Territorial Prelature of Pescia was promoted as Diocese of Pescia (gained territory from Archdiocese of Lucca) |
| 1727.07.23 |  Scotland | Apostolic Vicariate of Highland District of Scotland was restored (from Apostolic Vicariate of Scotland) |
| 1727.07.23 | Scotland | Apostolic Vicariate of Scotland was renamed as Apostolic Vicariate of Lowland District of Scotland (lost territory to establish Apostolic Vicariate of Highland District of Scotland) |
| 1728.11.15 | Italy | Diocese of Fabriano was established (from Diocese of Camerino) |
| 1729 | Germany | Diocese of Passau lost territory to Metropolitan Archdiocese of Wien |
| 1729.12.23 |  Serbia | Diocese of Smederevo was suppressed (to Diocese of Beograd and united to Diocese of Beograd) |
| 1730 |  Morocco | Titular Episcopal See of Fez was suppressed |
| 1731 |  French Guiana | Apostolic Prefecture of French Guiana was established (from Apostolic Prefecture of Îles de la Terre Ferme) |
| 1731 | Italy | Archpresbyterate nullius of Canosa was promoted as Territorial Prelature of Canosa |
| 1731.04.09 |  France | Diocese of Dijon was established (from Diocese of Langres and became suffragan of Lyon) |
| 1732.06.10 | Italy | Ordinariate of Italia continentale (Italo-Albanese Rite) was established |
| 1735 |  Bosnia and Herzegovina | Apostolic Vicariate of Bosnia was restored (from Diocese of Bosnia and Diocese of Makarska) |
| 1735 | Turkiye | Diocese of Ancyra (Armenian Rite) was established |
| 1735.07.27 | Italy | Diocese of Ferrara was promoted as Archdiocese of Ferrara |
| 1736 | Lebanon | Diocese of Saïdā (Maronite Rite) was suppressed (to Diocese of Tyr and Saïdā) |
| 1736 | Lebanon | Diocese of Tyr (Maronite Rite) was renamed as Diocese of Tyr and Saïdā (gained territory from the suppressed Diocese of Saïdā) |
| 1736 | Syria | Diocese of Damascus (Maronite Rite) was promoted as Archdiocese of Damascus |
| 1740.12.13 | Portugal | Patriarchal See of Lisboa Ocidental was renamed as Patriarchal See of Lisboa (gained territory from the suppressed Metropolitan Archdiocese of Lisboa Oriental and gained suffragan sees Guarda, Portalegre and Santiago de Cabo Verde) |
| 1740.12.13 | Portugal | Metropolitan Archdiocese of Lisboa Oriental was suppressed (to Patriarchal See of Lisboa) |
| 1741 |  Egypt | Apostolic Vicariate of Alexandria (Coptic Rite) was established |
| 1741 |  Myanmar | Apostolic Vicariate of Ava and Pegu was established (from Diocese of Tomé) |
| 1742.01.22 | France | Metropolitan Archdiocese of Besançon lost territory to Diocese of Saint-Claude |
| 1742.01.22 | France | Metropolitan Archdiocese of Lyon lost territory to Diocese of Saint-Claude |
| 1742.01.22 | France | Abbacy nullius of Saint-Claude was promoted as Diocese of Saint-Claude (gained territory from Metropolitan Archdiocese of Besançon and Metropolitan Archdiocese of Lyon and became suffragan of Lyon) |
| 1742.11.26 | Lebanon, Turkiye | Diocese of Cilicia (Armenian Rite) was promoted as Patriarchal See of Cilicia |
| 1743 | Germany | Apostolic Vicariate of Meißen was restored (from Apostolic Vicariate of Nordic Missions) |
| 1743.12.16 |  Guatemala | Diocese of Guatemala was promoted as Metropolitan Archdiocese of Guatemala (with suffragan sees Chiapas, Comayagua and León) |
| 1745.12.06 | Brazil | Territorial Prelature of Cuiabá was established (from Diocese of São Sebastião do Rio de Janeiro and became suffragan of São Salvador da Bahia) |
| 1745.12.06 | Brazil | Territorial Prelature of Goiás was established (from Diocese of São Sebastião do Rio de Janeiro and became suffragan of São Salvador da Bahia) |
| 1745.12.06 | Brazil | Diocese of Mariana was established (from Diocese of São Sebastião do Rio de Janeiro and became suffragan of São Salvador da Bahia) |
| 1745.12.06 | Brazil | Diocese of São Paulo was established (from Diocese of São Sebastião do Rio de Janeiro and became suffragan of São Salvador da Bahia) |
| 1747.12.10 | Ireland | Diocese of Cloyne and Ross was restored (from Diocese of Cork and Cloyne, from the suppressed Diocese of Ross and became suffragan of Cashel) |
| 1747.12.10 | Ireland | Diocese of Cork and Cloyne was renamed as Diocese of Cork (lost territory to establish Diocese of Cloyne and Ross) |
| 1747.12.10 | Ireland | Diocese of Ross was suppressed (to establish Diocese of Cloyne and Ross) |
| 1748.12.23 | Italy | Diocese of Pinerolo was established (from Metropolitan Archdiocese of Torino and Abbacy nullius of Santa Maria ad Abbadia Alpina and became suffragan of Torino) |
| 1749.11.26 | Italy | Diocese of Terlizzi was established (from Diocese of Giovinazzo and became suffragan of Bari e Canosa) |
| 1750 | Greece | Titular Episcopal See of Arcadia was suppressed |
| 1750 | Greece | Titular Metropolitan See of Mytilene was restored |
| 1750 |  Iraq | Mission sui juris of Mossul was established |
| 1750 |  Israel | Archdiocese of Jerusalem (Syriac Rite) was established |
| 1750 | Israel | Titular Episcopal See of Sabulon was suppressed |
| 1750 | Lebanon | Titular Episcopal See of Beirut was promoted as Titular Archiepiscopal See of Beirut |
| 1750 | Syria | Archdiocese of Haūrān (Greek-Melkite Rite) was established |
| 1751.07.06 | Italy | Patriarchal See of Aquileia was suppressed (to establish Metropolitan Archdiocese of Gorizia and Metropolitan Archdiocese of Udine) |
| 1751.07.06 | Italy | Metropolitan Archdiocese of Gorizia was established (from the suppressed Patriarchal See of Aquileia and with suffragan sees Koper, Ljubljana and Trieste) |
| 1751.07.06 | Italy | Metropolitan Archdiocese of Udine was established (from the suppressed Patriarchal See of Aquileia and with suffragan sees Ceneda, Concordia, Poreč, Pula, Treviso, Verona and Vicenza) |
| 1752 |  Curaçao,  Aruba,  Bonaire, Sint Eustatius and Saba,  Sint Maarten | Apostolic Prefecture of Curaçao was established (from Diocese of Caracas) |
| 1752.10.05 | Germany | Abbacy nullius of Heiligsten Erlöser in Fulda was promoted as Diocese of Fulda |
| 1754.12.12 |  Spain | Diocese of Santander was established (from Metropolitan Archdiocese of Burgos and Diocese of Oviedo and became suffragan of Burgos) |
| 1755 | China | Apostolic Vicariate of Yunnan 雲南 was suppressed (to Apostolic Vicariate of Szechwan 四川) |
| 1755 | Italy | Titular Episcopal See of Sinita was restored |
| 1756.08.11 | Ireland | Diocese of Clonmacnois was suppressed (to Diocese of Ardagh and united to Diocese of Ardagh) |
| 1758 |  Bulgaria | Metropolitan Archdiocese of Sofia was demoted as Apostolic Vicariate of Sofia–Plovdiv |
| 1759 | Israel | Diocese of Akka (Greek-Melkite Rite) was established (from Metropolitan Archdiocese of Tyr and without ecclesiastical province) |
| 1760 | Greece | Titular Metropolitan See of Gortyna was restored |
| 1760 | Turkiye | Titular Episcopal See of Samosata was restored |
| 1762.06.27 | Syria | Apostolic Vicariate of Aleppo was restored |
| 1763 |  Poland | Diocese of Pomezania was suppressed (to Diocese of Chełmno) |
| 1763 |  Saint Pierre and Miquelon | Apostolic Prefecture of Îles Saint-Pierre et Miquelon was established (from Diocese of Québec) |
| 1763 |  Senegal | Apostolic Prefecture of Sénégal was established (from Diocese of Funchal) |
| 1763.07.11 | Poland | Diocese of Kraków lost territory to Diocese of Przemyśl |
| 1767 | Italy | Diocese of Ales exchanged territory with Metropolitan Archdiocese of Cagliari |
| 1767 | Italy | Metropolitan Archdiocese of Cagliari exchanged territory with Diocese of Ales |
| 1768 | Italy | Diocese of Alba lost territory to Diocese of Mondovì |
| 1768 | Italy | Diocese of Asti lost territory to Diocese of Mondovì |
| 1768 | Lebanon | Diocese of Batroun (Maronite Rite) was renamed as Diocese of Batroun–Jbeil (gained territory from the suppressed Diocese of Jbeil) |
| 1768 | Lebanon | Diocese of Bāniyās (Greek-Melkite Rite) was suppressed |
| 1768 | Lebanon | Diocese of Jbeil (Maronite Rite) was suppressed (to Diocese of Batroun–Jbeil) |
| 1770 |  Hungary | Metropolitan Archdiocese of Esztergom lost territory to Diocese of Transilvania |
| 1770.06.01 | Portugal | Diocese of Penafiel was established (from Diocese of Porto) |
| 1770.07.10 | Portugal | Diocese of Beja was restored (from Metropolitan Archdiocese of Évora and became suffragan of Évora) |
| 1770.07.10 | Portugal | Diocese of Bragança was established (from Diocese of Miranda and became suffragan of Braga) |
| 1770.07.10 | Portugal | Diocese of Pinhel was established (from Diocese of Lamego and Diocese of Viseu) |
| 1770.10.13 | Italy | Diocese of Ischia lost territory to Diocese of Gaeta |
| 1771.06.07 | Portugal | Diocese of Castelo Branco was established (from Diocese of Guarda) |
| 1771.09.19 | Ukraine | Apostolic Vicariate of Mukačeve (Ruthenian Rite) was promoted as Diocese of Mukačeve (became suffragan of Esztergom) |
| 1772 | Poland | Diocese of Chełm lost territory to Diocese of Przemyśl |
| 1772.04.29 | Italy | Diocese of Spoleto lost territory to Diocese of Foligno |
| 1772.06.01 | Italy | Diocese of Biella was established (from Diocese of Vercelli and became suffragan of Torino) |
| 1772.06.15 | Italy | Diocese of Chiusi lost territory to Diocese of Montalcino |
| 1772.06.15 | Italy | Diocese of Pienza lost territory to Metropolitan Archdiocese of Siena and Diocese of Montalcino |
| 1772.08.03 | Italy | Abbacy nullius of San Pietro di Novalesa lost territory to Diocese of Susa |
| 1772.08.03 | Italy | Abbacy nullius of San Giusto di Susa was promoted as Diocese of Susa (gained territory from Metropolitan Archdiocese of Torino and Abbacy nullius of San Pietro di Novalesa and became suffragan of Torino) |
| 1772.08.03 | Italy | Metropolitan Archdiocese of Torino lost territory to Diocese of Susa |
| 1773 | India | Mission sui juris of Madura was suppressed (to Diocese of São Tomé de Meliapor and Mission sui juris of Coromandel Coast) |
| 1773.07.09 |  Croatia | Diocese of Bosnia was renamed as Diocese of Bosnia i Srijem (gained territory from the suppressed Diocese of Srijem) |
| 1773.07.09 | Serbia | Diocese of Srijem was suppressed (to Diocese of Bosnia i Srijem) |
| 1773.09.10 | Portugal | Diocese of Pinhel lost territory to Diocese of Lamego |
| 1774 | Turkiye | Diocese of Adana (Armenian Rite) was established |
| 1774.04.12 | Portugal | Diocese of Aveiro was established (from Diocese of Coimbra and became suffragan of Braga) |
| 1775 | Hungary | Metropolitan Archdiocese of Kalocsa lost territory to Diocese of Csanád |
| 1776 | India | Apostolic Prefecture of French Colonies in India was established (from Mission sui juris of Coromandel Coast) |
| 1776.03.13 |  Slovakia | Diocese of Banská Bystrica was established (from Metropolitan Archdiocese of Esztergom and became suffragan of Esztergom) |
| 1776.03.13 | Slovakia | Diocese of Rožňava was established (from Metropolitan Archdiocese of Esztergom and became suffragan of Esztergom) |
| 1776.03.13 | Slovakia | Diocese of Spiš was established (from Metropolitan Archdiocese of Esztergom and became suffragan of Esztergom) |
| 1777 | Italy | Diocese of Rimini lost territory to Diocese of Cesena |
| 1777.06.16 | Hungary | Diocese of Székesfehérvár was established (from Diocese of Győr and Diocese of Veszprém and became suffragan of Esztergom) |
| 1777.06.17 | Croatia, Bosnia and Herzegovina,  Slovenia | Apostolic Vicariate of Marča (Croatian Rite) was promoted as Diocese of Gornji Tkalec (became suffragan of Esztergom) |
| 1777.06.17 | Hungary | Diocese of Szombathely was established (from Diocese of Veszprém and Diocese of Zagreb and became suffragan of Esztergom) |
| 1777.06.23 | Romania | Diocese of Oradea Mare (Romanian Rite) was established (from Diocese of Oradea Mare) |
| 1777.07.21 | France | Diocese of Saint-Dié was established (from Diocese of Toul and became suffragan of Trier) |
| 1777.11.19 | France | Diocese of Nancy was established (from Diocese of Toul and became suffragan of Trier) |
| 1777.12.05 |  Czechia | Diocese of Brno was established (from Diocese of Olomouc and became suffragan of Olomouc) |
| 1777.12.05 | Czechia | Diocese of Olomouc was promoted as Metropolitan Archdiocese of Olomouc (with suffragan see Brno and lost territory to establish Diocese of Brno) |
| 1777.12.15 |  Mexico | Diocese of Linares was established (from Diocese of Michoacán and became suffragan of México) |
| 1778 | Austria | Metropolitan Archdiocese of Salzburg lost territory to Diocese of Brixen |
| 1778 |  Russia | Diocese of Smoleńsk (Ukrainian Rite) was suppressed |
| 1778.02.16 |  Venezuela | Diocese of Mérida was established (from Metropolitan Archdiocese of Santafé en Nueva Granada and Diocese of Caracas and became suffragan of Santafé en Nueva Granada) |
| 1778.11.11 | Portugal | Diocese of Penafiel was suppressed (to Diocese of Porto) |
| 1779 | Turkiye | Apostolic Vicariate of Istanbul (Armenian Rite) was established |
| 1779.05.07 | Mexico | Diocese of Sonora was established (from Diocese of Durango and became suffragan of México) |
| 1779.07.21 | Italy | Diocese of Galtellì–Nuoro was restored (from Metropolitan Archdiocese of Cagliari, Metropolitan Archdiocese of Oristano and Diocese of Alghero and became suffragan of Cagliari) |
| 1779.08.18 | France | Diocese of Chambéry was established (from Diocese of Grenoble and without ecclesiastical province) |
| 1779.12.01 | Italy | Archpresbyterate nullius of Santa Maria Assunta di Carpi was promoted as Diocese of Carpi (became suffragan of Bologna) |
| 1780.02.11 | Germany | Apostolic Vicariate of Nordens was suppressed (to Apostolic Vicariate of Nordic Missions) |
| 1780.09.27 | Portugal | Diocese of Bragança was renamed as Diocese of Bragança e Miranda (gained territory from the suppressed Diocese of Miranda) |
| 1780.09.27 | Portugal | Diocese of Miranda was suppressed (to Diocese of Bragança e Miranda) |
| 1781 | Lebanon | Patriarchal See of Antioch (Syriac Rite) was restored |
| 1781 |  Sweden | Apostolic Prefecture of Sweden was established (from Apostolic Vicariate of Nordic Missions) |
| 1782 | France | Metropolitan Archdiocese of Besançon exchanged territory with Diocese of Basel |
| 1782 |  Switzerland | Diocese of Basel exchanged territory with Metropolitan Archdiocese of Besançon |
| 1782.04.30 | Spain | Diocese of Ibiza was restored (from Diocese of Mallorca and became suffragan of Tarragona) |
| 1782.09.18 | Italy | Diocese of Volterra lost territory to Diocese of Colle di Val d’Elsa |
| 1783 |  Mozambique | Apostolic Administration of Mozambique was promoted as Territorial Prelature of Mozambique |
| 1783 | Turkiye | Diocese of Mardin (Syriac Rite) was established |
| 1783.03.27 | Spain | Diocese of Tudela was established (from Diocese of Pamplona and Diocese of Tarazona and became suffragan of Burgos) |
| 1783.04.15 |  Belarus | Metropolitan Archdiocese of Mohilev was established (from Diocese of Inflanty and Diocese of Smoleńsk) |
| 1783.09.23 | Sweden | Apostolic Prefecture of Sweden was promoted as Apostolic Vicariate of Sweden |
| 1784 | Croatia | Diocese of Poreč exchanged territory with Diocese of Trieste |
| 1784 | Germany | Diocese of Passau lost territory to Metropolitan Archdiocese of Wien |
| 1784 | Hungary | Diocese of Győr lost territory to Metropolitan Archdiocese of Wien |
| 1784 | Italy | Metropolitan Archdiocese of Bologna lost territory to Diocese of Pistoia |
| 1784 | Italy | Metropolitan Archdiocese of Gorizia lost territory to Diocese of Trieste |
| 1784 | Italy,  San Marino | Diocese of Montefeltro lost territory to Diocese of Sansepolcro |
| 1784 | Italy | Diocese of Pistoia lost territory to Diocese of Pescia |
| 1784 | Italy | Diocese of Trieste lost territory to Diocese of Cittanova, Diocese of Koper and Diocese of Ljubljana |
| 1784.02.06 | Italy | Ordinariate of Silicia (Italo-Albanese Rite) was established |
| 1784.02.17 | Czechia | Metropolitan Archdiocese of Praha lost territory to Diocese of Litoměřice |
| 1784.05.17 | India | Mission sui juris of Hindustan was established (from Apostolic Vicariate of Great Mogul) |
| 1784.05.30 |  Canada | Apostolic Prefecture of Newfoundland was established (from Diocese of Québec) |
| 1784.05.30 | Canada | Diocese of Québec lost territory to Diocese of Santiago |
| 1784.11.26 |  USA | Apostolic Prefecture of United States of America was established (from Diocese of Québec and Apostolic Vicariate of London District) |
| 1785 | Iraq | Diocese of Amadiyah (Chaldean Rite) was established (became suffragan of Babylon) |
| 1785 | Spain | Diocese of Pamplona lost territory to Diocese of Jaca |
| 1785.01.28 | Austria | Diocese of Linz was established (from Diocese of Passau and became suffragan of Wien) |
| 1785.01.28 | Austria | Diocese of Sankt Pölten was established (from Diocese of Passau, from the suppressed Diocese of Wiener Neustadt and became suffragan of Wien) |
| 1785.01.28 | Austria | Diocese of Wiener Neustadt was suppressed (to Metropolitan Archdiocese of Wien and to establish Diocese of Sankt Pölten) |
| 1785.04 | Italy | Diocese of Acquapendente exchanged territory with Diocese of Sovana |
| 1785.04 | Italy | Diocese of Sovana exchanged territory with Diocese of Acquapendente |
| 1785.07.08 | Italy | Diocese of Matelica was restored (from Diocese of Camerino) |
| 1785.09.20 | Czechia | Diocese of České Budějovice was established (from Metropolitan Archdiocese of Praha and became suffragan of Praha) |
| 1786 | Italy | Diocese of Feltre lost territory to Diocese of Trento |
| 1786.03.13 | Poland | Diocese of Tarnów was established (from Diocese of Kraków and became suffragan of Lviv) |
| 1786.04.29 | Austria | Diocese of Leoben was established (from Metropolitan Archdiocese of Salzburg and Diocese of Passau and became suffragan of Salzburg) |
| 1786.07.01 |  Ecuador | Diocese of Cuenca was established (from Diocese of Quito and became suffragan of Lima) |
| 1787 | Austria | Diocese of Lavant lost territory to Diocese of Gurk |
| 1787 | Austria | Metropolitan Archdiocese of Salzburg lost territory to Diocese of Gurk and Diocese of Seckau |
| 1787 | Greece | Diocese of Chersonissos was suppressed |
| 1787 | Italy | Diocese of Bergamo exchanged territory with Metropolitan Archdiocese of Milano |
| 1787 | Italy | Metropolitan Archdiocese of Gorizia lost territory to Diocese of Gurk |
| 1787 | Italy | Metropolitan Archdiocese of Milano (Ambrosian Rite) exchanged territory with Diocese of Bergamo |
| 1787 | Italy | Diocese of Padova lost territory to Diocese of Trento |
| 1787 | Slovenia | Diocese of Ljubljana lost territory to Diocese of Gurk |
| 1787.02.03 | Slovakia | Diocese of Spiš lost territory to Diocese of Mukačeve |
| 1787.05.07 | Slovakia | Diocese of Rožňava lost territory to Diocese of Mukačeve |
| 1787.09.10 |  Cuba | Diocese of La Habana was established (from Diocese of Santiago and became suffragan of Santo Domingo) |
| 1787.10.16 | Croatia | Diocese of Pula lost territory to Diocese of Senj–Modruš |
| 1787.12.17 | Italy | Diocese of Camerino was promoted as Archdiocese of Camerino |
| 1788 | Poland | Diocese of Wrocław lost territory to Metropolitan Archdiocese of Olomouc |
| 1788.03.08 | Croatia | Diocese of Pedena was suppressed (to establish Diocese of Gradisca) |
| 1788.03.08 | Italy | Metropolitan Archdiocese of Gorizia was suppressed (to Metropolitan Archdiocese of Ljubljana and to establish Diocese of Gradisca) |
| 1788.03.08 | Italy | Diocese of Gradisca was established (from the suppressed Metropolitan Archdiocese of Gorizia, Diocese of Pedena and Diocese of Trieste and became suffragan of Ljubljana) |
| 1788.03.08 | Italy | Diocese of Trieste was suppressed (to establish Diocese of Gradisca) |
| 1788.03.08 | Slovenia | Diocese of Ljubljana was promoted as Metropolitan Archdiocese of Ljubljana (with suffragan sees Gradisca, Koper, Poreč and Pula and gained territory from the suppressed Metropolitan Archdiocese of Gorizia) |
| 1789 | Iraq | Metropolitan Archdiocese of Kirkuk (Chaldean Rite) was established |
| 1789 | Italy | Diocese of Pienza lost territory to Diocese of Montalcino |
| 1789.01.16 | Italy | Archpresbyterate nullius of Acquaviva delle Fonti was restored (from Metropolitan Archdiocese of Bari e Canosa) |
| 1789.07.18 | Italy | Archdiocese of Lucca exchanged territory with Metropolitan Archdiocese of Pisa |
| 1789.07.18 | Italy | Metropolitan Archdiocese of Pisa exchanged territory with Archdiocese of Lucca |
| 1789.11.06 | USA | Apostolic Prefecture of United States of America was promoted as Diocese of Baltimore |
| 1790 | France | Abbacy nullius of Cluny was suppressed |
| 1790 | Iraq | Archdiocese of Mossul (Syriac Rite) was established (without ecclesiastical province) |
| 1790 | Syria | Archdiocese of Aleppo (Greek-Melkite Rite) was promoted as Metropolitan Archdiocese of Aleppo |
| 1790.05.20 | Venezuela | Diocese of Santo Tomás de Guayana was established (from Diocese of Puerto Rico and became suffragan of Santo Domingo) |
| 1790.07.12 | France | Diocese of Lodève was suppressed (to Diocese of Montpellier) |
| 1790.08.08 | Poland | Diocese of Chełm was renamed as Diocese of Chełm–Lublin (gained territory from Diocese of Kraków) |
| 1790.08.08 | Poland | Diocese of Kraków lost territory to Diocese of Chełm–Lublin |
| 1791 | Italy | Diocese of Massa Marittima e Populonia lost territory to Diocese of Brugnato |
| 1791.09.12 | Italy | Diocese of Gorizia e Gradisca was restored (from the suppressed Diocese of Gradisca and became suffragan of Ljubljana) |
| 1791.09.12 | Italy | Diocese of Gradisca was suppressed (to establish Diocese of Gorizia e Gradisca and Diocese of Trieste) |
| 1791.09.12 | Italy | Diocese of Trieste was restored (from the suppressed Diocese of Gradisca and became suffragan of Ljubljana) |
| 1792.04.23 | Germany | Abbacy nullius of St. Stephanus und Vitus in Corvey was promoted as Diocese of Corvey (became suffragan of Mainz) |
| 1792.05.05 | Germany | Diocese of Paderborn lost territory to Diocese of Corvey |
| 1792.09.07 | Italy | Abbacy nullius of Santa Maria di Vangadizza was suppressed (to Diocese of Adria) |
| 1793.04.25 | USA | Diocese of Louisiana and the Two Floridas was established (from Diocese of La Habana and became suffragan of Santo Domingo) |
| 1794 | Croatia | Diocese of Pula lost territory to Diocese of Trieste |
| 1794 | Italy | Diocese of Pinerolo lost territory to Diocese of Susa |
| 1794 | Italy | Abbacy nullius of Santa Maria di Sesto was suppressed (to Diocese of Concordia) |
| 1794.01.12 | Poland | Diocese of Poznań lost territory to Metropolitan Archdiocese of Gniezno |
| 1795 | Belarus | Diocese of Pinsk–Turaŭ (Ukrainian Rite) was suppressed |
| 1795 | Poland | Metropolitan Archdiocese of Gniezno lost territory to Diocese of Kraków |
| 1795 | Ukraine | Diocese of Lutsk–Ostroh (Ukrainian Rite) was suppressed |
| 1795 | Ukraine, Belarus | Diocese of Volodymyr–Brėst (Ukrainian Rite) was suppressed |
| 1795.07.23 | Spain | Diocese of Menorca was restored (from Diocese of Mallorca and became suffragan of Valencia) |
| 1796.01.05 | Canada | Apostolic Prefecture of Newfoundland was promoted as Apostolic Vicariate of Newfoundland |
| 1797 | Italy | Diocese of Ventimiglia lost territory to Diocese of Nice |
| 1797.07.04 | Italy | Diocese of Pontremoli was established (from Diocese of Brugnato and Diocese of Luni–Sarzana and became suffragan of Pisa) |
| 1798 | Greece | Apostolic Vicariate of Kea–Kythnos was suppressed (to Diocese of Milos) |
| 1798 | Greece | Apostolic Vicariate of Sifnos–Serifos was suppressed (to Diocese of Milos) |
| 1798 | Italy | Metropolitan Archdiocese of Sassari lost territory to Diocese of Alghero |
| 1798.03.06 | Poland | Diocese of Supraśl (Ukrainian Rite) was established (from Metropolitan Archdiocese of Kyiv–Halyč and former Diocese of Volodymyr–Brėst) |
| 1798.08.08 | Poland | Diocese of Chełm–Lublin lost territory to Diocese of Lutsk and Zytomierz |
| 1798.08.08 | Ukraine | Diocese of Kyiv–Černihiv lost territory to Diocese of Lutsk and Zytomierz |
| 1798.08.08 | Ukraine | Diocese of Luck was renamed as Diocese of Lutsk and Zytomierz (gained territory from Diocese of Chełm–Lublin and Diocese of Kyiv–Černihiv and gained territory from the suppressed Diocese of Žytomyr) |
| 1798.08.08 | Ukraine | Diocese of Žytomyr was suppressed (to Diocese of Lutsk and Zytomierz) |
| 1798.09.18 | Italy | Diocese of Pontremoli lost territory to Metropolitan Archdiocese of Pisa |
| 1798.10.16 | Belarus | Diocese of Minsk was established (from Metropolitan Archdiocese of Mohilev and became suffragan of Mohilev) |
| 1798.10.16 | Poland | Diocese of Warszawa was established (from Metropolitan Archdiocese of Gniezno and became suffragan of Gniezno) |
| 1798.10.16 | Ukraine | Diocese of Kyiv–Černihiv was suppressed (to Metropolitan Archdiocese of Mohilev and Diocese of Lutsk and Zytomierz) |
| 1798.11.15 | Ukraine, Belarus | Diocese of Volodymyr–Brėst (Ukrainian Rite) was restored |
| 1798.11.17 |  Latvia,  Estonia | Diocese of Inflanty was suppressed (to Diocese of Vilnius) |
| 1798.11.18 | Ukraine | Diocese of Lutsk–Ostroh (Ukrainian Rite) was restored |
| 1799.03.16 | Poland | Diocese of Wigry was established (from Diocese of Lutsk and Zytomierz, Diocese of Vilnius and Diocese of Žemaitija) |
| 1799.06.20 | Poland | Diocese of Chełm–Lublin lost territory to Diocese of Kraków |
| 1800 |  Armenia | Titular Episcopal See of Etchmiadzin was established |
| 1800 | Bosnia and Herzegovina | Titular Episcopal See of Dulma was established |
| 1800 |  Cyprus | Titular Episcopal See of Amathus was restored |
| 1800 |  Georgia | Titular Episcopal See of Tiflis was suppressed |
| 1800 | Greece | Diocese of Milos was suppressed |
| 1800 | Iraq | Diocese of Mossul (Chaldean Rite) was established (without ecclesiastical province) |
| 1800 | Israel | Archdiocese of Jerusalem (Syriac Rite) was suppressed |
| 1800 | Israel | Titular Episcopal See of Ptolemais was restored |
| 1800 | Lebanon | Diocese of Saidnaya (Greek-Melkite Rite) was suppressed |
| 1800 | Syria | Diocese of Hama (Syriac Rite) was established |
| 1800 | Syria | Diocese of Jabrud (Greek-Melkite Rite) was established |
| 1800 | Syria | Diocese of Nabk (Syriac Rite) was established |
| 1800 | Syria | Diocese of Qâra (Greek-Melkite Rite) was suppressed |
| 1800 | Turkiye | Titular Episcopal See of Comana Ponti was restored |
| 1800.09.09 | Poland | Diocese of Kraków lost territory to Diocese of Wrocław |
| 1800.09.09 | Poland | Diocese of Płock lost territory to Diocese of Warszawa |
