 | 1924 | 1925 | 1926 |  |
Date | Country | Change |
| 1925 |  Albania | Titular Episcopal See of Aulon was renamed as Titular Episcopal See of Aulona |
| 1925 | Albania | Titular Episcopal See of Croia was renamed as Titular Episcopal See of Croæ |
| 1925 |  Algeria | Titular Episcopal See of Bitha was renamed as Titular Episcopal See of Bida |
| 1925 | Algeria | Titular Episcopal See of Centuria was established |
| 1925 | Algeria | Titular Episcopal See of Dusa was established |
| 1925 | Algeria | Titular Episcopal See of Phessa was renamed as Titular Episcopal See of Fessei |
| 1925 | Algeria | Titular Episcopal See of Phussala was renamed as Titular Episcopal See of Fussala |
| 1925 | Algeria | Titular Episcopal See of Garba was established |
| 1925 | Algeria | Titular Episcopal See of Gibba was established |
| 1925 | Algeria | Titular Episcopal See of Lambaisis was renamed as Titular Episcopal See of Lambæsis |
| 1925 | Algeria | Titular Episcopal See of Lesbi was renamed as Titular Episcopal See of Lesvi |
| 1925 | Algeria | Titular Episcopal See of Madauros was renamed as Titular Episcopal See of Madaurus |
| 1925 | Algeria | Titular Episcopal See of Maximiana was established |
| 1925 | Algeria | Titular Episcopal See of Midila was restored |
| 1925 | Algeria | Titular Episcopal See of Mulia was established |
| 1925 | Algeria | Titular Episcopal See of Sila was established |
| 1925 | Algeria | Titular Episcopal See of Tubunæ was renamed as Titular Episcopal See of Thubunæ |
| 1925 | Algeria | Titular Episcopal See of Tiddi was established |
| 1925 |  Armenia | Titular Episcopal See of Siunia was suppressed |
| 1925 |  Bulgaria | Titular Episcopal See of Abrytus was renamed as Titular Episcopal See of Abrittum |
| 1925 | Bulgaria | Titular Episcopal See of Apiara was renamed as Titular Episcopal See of Appiaria |
| 1925 | Bulgaria | Titular Episcopal See of Odessus was established |
| 1925 | Bulgaria | Titular Metropolitan See of Ratiaria was established |
| 1925 |  Croatia | Titular Episcopal See of Knin was renamed as Titular Episcopal See of Tinum |
| 1925 |  Cyprus | Titular Episcopal See of Chytris was renamed as Titular Episcopal See of Chytri |
| 1925 | Cyprus | Titular Metropolitan See of Salamis postea Constantia was renamed as Titular Metropolitan See of Salamis |
| 1925 | Cyprus | Titular Episcopal See of Tamassus was renamed as Titular Episcopal See of Tamasus |
| 1925 |  Egypt | Titular Metropolitan See of Antinœ was renamed as Titular Metropolitan See of Antinoupolis |
| 1925 | Egypt | Titular Episcopal See of Aphrodytopolis was renamed as Titular Episcopal See of Aphroditopolis |
| 1925 | Egypt | Titular Archiepiscopal See of Cabassa was demoted as Titular Episcopal See of Cabasa |
| 1925 | Egypt | Titular Episcopal See of Casium was renamed as Titular Episcopal See of Casium |
| 1925 | Egypt | Titular Episcopal See of Coptos was renamed as Titular Episcopal See of Coptus |
| 1925 | Egypt | Titular Episcopal See of Gerrha was renamed as Titular Episcopal See of Geras |
| 1925 | Egypt | Titular Episcopal See of Hephæstum was renamed as Titular Episcopal See of Hephæstus |
| 1925 | Egypt | Titular Episcopal See of Hermopolis maior was renamed as Titular Episcopal See of Hermopolis Magna |
| 1925 | Egypt | Titular Episcopal See of Hermopolis minor was renamed as Titular Episcopal See of Hermopolis Parva |
| 1925 | Egypt | Titular Metropolitan See of Leontopolis in Bithynia was renamed as Titular Metropolitan See of Leontopolis |
| 1925 | Egypt | Titular Episcopal See of Letopolis was established |
| 1925 | Egypt | Titular Episcopal See of Nitria was restored |
| 1925 | Egypt | Titular Episcopal See of Ombus was renamed as Titular Episcopal See of Ombus |
| 1925 | Egypt | Titular Episcopal See of Panopolis was renamed as Titular Episcopal See of Panopolis |
| 1925 | Egypt | Titular Metropolitan See of Ptolemais antea Syis was renamed as Titular Metropolitan See of Ptolemais |
| 1925 | Egypt | Titular Episcopal See of Rhinocolura was renamed as Titular Episcopal See of Rhinocorura |
| 1925 | Egypt | Titular Episcopal See of Sata was established |
| 1925 | Egypt | Titular Archiepiscopal See of Tamiathis was demoted as Titular Episcopal See of Tamiathis |
| 1925 | Egypt | Titular Episcopal See of Thennesis was renamed as Titular Episcopal See of Thennesus |
| 1925 | Egypt | Titular Archiepiscopal See of Theodosia was demoted as Titular Episcopal See of Theodosiopolis |
| 1925 |  Ethiopia | Titular Episcopal See of Adulis was established |
| 1925 | Ethiopia | Titular Archiepiscopal See of Auxume was demoted as Titular Episcopal See of Axomis |
| 1925 |  Georgia | Titular Metropolitan See of Phasis was established |
| 1925 |  Greece | Titular Episcopal See of Anastasiopolis was suppressed |
| 1925 | Greece | Titular Episcopal See of Anastasiopolis (Syriac Rite) was suppressed |
| 1925 | Greece | Titular Episcopal See of Bargala was established |
| 1925 | Greece | Titular Episcopal See of Cardica was renamed as Titular Episcopal See of Cardicium |
| 1925 | Greece | Titular Episcopal See of Karpathus was renamed as Titular Episcopal See of Carpathus |
| 1925 | Greece | Titular Archiepiscopal See of Chalcis was demoted as Titular Episcopal See of Chalcis |
| 1925 | Greece | Titular Episcopal See of Citrus was established |
| 1925 | Greece | Titular Episcopal See of Daulis was renamed as Titular Episcopal See of Daulia |
| 1925 | Greece | Titular Episcopal See of Doberas was renamed as Titular Episcopal See of Doberus |
| 1925 | Greece | Titular Archiepiscopal See of Drama was demoted as Titular Episcopal See of Drama |
| 1925 | Greece | Titular Episcopal See of Ezerus was established |
| 1925 | Greece | Titular Episcopal See of Halmiros was renamed as Titular Episcopal See of Halmyrus |
| 1925 | Greece | Titular Archiepiscopal See of Lacedæmon was demoted as Titular Episcopal See of Lacedæmon |
| 1925 | Greece | Titular Episcopal See of Lamia was established |
| 1925 | Greece | Titular Metropolitan See of Larissa was renamed as Titular Metropolitan See of Larissa |
| 1925 | Greece | Titular Episcopal See of Leros was renamed as Titular Episcopal See of Lerus |
| 1925 | Greece | Titular Episcopal See of Lete was renamed as Titular Episcopal See of Lete |
| 1925 | Greece | Titular Archiepiscopal See of Macra was demoted as Titular Episcopal See of Macra |
| 1925 | Greece | Titular Episcopal See of Maronia was renamed as Titular Episcopal See of Maronea |
| 1925 | Greece | Titular Episcopal See of Modon was renamed as Titular Episcopal See of Methone |
| 1925 | Greece | Titular Archiepiscopal See of Metymna was demoted as Titular Episcopal See of Methymna |
| 1925 | Greece | Titular Metropolitan See of Mytilene was demoted as Titular Episcopal See of Mytilene |
| 1925 | Greece | Titular Metropolitan See of Patrasso was renamed as Titular Metropolitan See of Patræ |
| 1925 | Greece | Titular Episcopal See of Salona was established |
| 1925 | Greece | Titular Archiepiscopal See of Serræ was renamed as Titular Archiepiscopal See of Sirrhæ |
| 1925 | Greece | Titular Archiepiscopal See of Stobi was established |
| 1925 | Greece | Titular Episcopal See of Thaumaci was renamed as Titular Episcopal See of Thaumacus |
| 1925 | Greece | Titular Metropolitan See of Traianopolis (Armenian Rite) was suppressed |
| 1925 | Greece | Titular Episcopal See of Tricale was renamed as Titular Episcopal See of Tricca |
| 1925 | Greece | Titular Episcopal See of Zapara was established |
| 1925 | Greece | Titular Episcopal See of Ænus s. Hænus was renamed as Titular Episcopal See of Ænus |
| 1925 |  Israel | Titular Episcopal See of Diocæsarea antea Sepphoris was renamed as Titular Episcopal See of Diocæsarea |
| 1925 | Israel | Titular Archiepiscopal See of Helenopolis was demoted as Titular Episcopal See of Helenopolis |
| 1925 | Israel | Titular Episcopal See of Ioppe was renamed as Titular Episcopal See of Joppe |
| 1925 | Israel | Titular Episcopal See of Maximianopolis was renamed as Titular Episcopal See of Maximianopolis |
| 1925 | Israel | Titular Episcopal See of Porphyreon was renamed as Titular Episcopal See of Porphyrium |
| 1925 | Israel | Titular Archiepiscopal See of Ptolemais was demoted as Titular Episcopal See of Ptolemais |
| 1925 | Israel | Titular Episcopal See of Giovanni S. d’Acri (Maronite Rite) was renamed as Titular Episcopal See of Ptolemais |
| 1925 | Israel | Titular Episcopal See of Samaria was renamed as Titular Episcopal See of Sebaste |
| 1925 |  Jordan | Titular Episcopal See of Aila was renamed as Titular Episcopal See of Aila |
| 1925 | Jordan | Titular Episcopal See of Hesbon was renamed as Titular Episcopal See of Esbus |
| 1925 | Jordan | Titular Episcopal See of Gadaræ was renamed as Titular Episcopal See of Gadara |
| 1925 |  Lebanon | Titular Archiepiscopal See of Beirut was demoted as Titular Episcopal See of Beirut |
| 1925 | Lebanon | Titular Archiepiscopal See of Heliopolis was demoted as Titular Episcopal See of Heliopolis |
| 1925 | Lebanon | Titular Episcopal See of Tripolis was renamed as Titular Episcopal See of Tripolis |
| 1925 |  Libya | Titular Metropolitan See of Darnis was demoted as Titular Episcopal See of Darnis |
| 1925 | Libya | Titular Episcopal See of Leptis Magna was renamed as Titular Episcopal See of Leptis Maior |
| 1925 | Libya | Titular Archiepiscopal See of Ptolemais was demoted as Titular Episcopal See of Ptolemais |
| 1925 | Libya | Titular Episcopal See of Sabrata was renamed as Titular Episcopal See of Sabratha |
| 1925 | Libya | Titular Episcopal See of Theuchira was renamed as Titular Episcopal See of Teuchira |
| 1925 |  Montenegro | Titular Metropolitan See of Dioclea was renamed as Titular Metropolitan See of Doclea |
| 1925 |  Palestine | Titular Episcopal See of Hiericho was renamed as Titular Episcopal See of Jericho |
| 1925 | Palestine | Titular Metropolitan See of Nazareth was suppressed |
| 1925 |  Romania | Titular Archiepiscopal See of Constantia antea Tomi was renamed as Titular Archiepiscopal See of Constantia |
| 1925 |  Russia | Titular Episcopal See of Tana was restored |
| 1925 |  Serbia | Titular Metropolitan See of Viminacium was restored |
| 1925 |  Syria | Titular Episcopal See of Abila was renamed as Titular Episcopal See of Abyla |
| 1925 | Syria | Titular Episcopal See of Hamatha was renamed as Titular Episcopal See of Amatha |
| 1925 | Syria | Titular Episcopal See of Hamatha (Maronite Rite) was renamed as Titular Episcopal See of Amatha |
| 1925 | Syria | Titular Metropolitan See of Apamea was renamed as Titular Metropolitan See of Apamea |
| 1925 | Syria | Titular Episcopal See of Arethusus was renamed as Titular Episcopal See of Arethusa |
| 1925 | Syria | Titular Episcopal See of Arethusus (Syriac Rite) was renamed as Titular Episcopal See of Arethusa |
| 1925 | Syria | Titular Episcopal See of Balaneæ was renamed as Titular Episcopal See of Balanea |
| 1925 | Syria | Titular Episcopal See of Constantia was renamed as Titular Episcopal See of Constantia |
| 1925 | Syria | Titular Episcopal See of Danaba-orum was renamed as Titular Episcopal See of Danaba |
| 1925 | Syria | Titular Episcopal See of Evaria was renamed as Titular Episcopal See of Euhara |
| 1925 | Syria | Titular Archiepiscopal See of Laodicea was renamed as Titular Archiepiscopal See of Laodicea ad mare |
| 1925 | Syria | Titular Archiepiscopal See of Laodicea (Maronite Rite) was renamed as Titular Archiepiscopal See of Laodicea ad mare |
| 1925 | Syria | Titular Episcopal See of Laodicea (Greek-Melkite Rite) was renamed as Titular Episcopal See of Laodicea ad mare |
| 1925 | Syria | Titular Episcopal See of Mariama was renamed as Titular Episcopal See of Mariamme |
| 1925 | Syria | Titular Episcopal See of Nebo was renamed as Titular Episcopal See of Neve |
| 1925 | Syria | Titular Archiepiscopal See of Palmyra was demoted as Titular Episcopal See of Palmyra |
| 1925 | Syria | Titular Episcopal See of Paltos was renamed as Titular Episcopal See of Paltus |
| 1925 | Syria | Titular Episcopal See of Raphaneæ was renamed as Titular Episcopal See of Raphanea |
| 1925 | Syria | Titular Episcopal See of Sergiopolis antea Resapha was promoted as Titular Metropolitan See of Sergiopolis |
| 1925 |  Tunisia | Titular Episcopal See of Abbir Cellense was renamed as Titular Episcopal See of Abbir |
| 1925 | Tunisia | Titular Episcopal See of Agæ was renamed as Titular Episcopal See of Aga |
| 1925 | Tunisia | Titular Episcopal See of Ammædæra was renamed as Titular Episcopal See of Ammædara |
| 1925 | Tunisia | Titular Episcopal See of Bulla Regia was renamed as Titular Episcopal See of Bulla Regia |
| 1925 | Tunisia | Titular Episcopal See of Cillium was established |
| 1925 | Tunisia | Titular Episcopal See of Dionysiana was established |
| 1925 | Tunisia | Titular Episcopal See of Furnos Majus was renamed as Titular Episcopal See of Furni Majus |
| 1925 | Tunisia | Titular Episcopal See of Gurza was established |
| 1925 | Tunisia | Titular Episcopal See of Hippo Zarytus was renamed as Titular Episcopal See of Hippo Diarrhytus |
| 1925 | Tunisia | Titular Episcopal See of Limisa was established |
| 1925 | Tunisia | Titular Episcopal See of Mater was renamed as Titular Episcopal See of Matera |
| 1925 | Tunisia | Titular Episcopal See of Nara was established |
| 1925 | Tunisia | Titular Episcopal See of Scillium was renamed as Titular Episcopal See of Scilium |
| 1925 | Tunisia | Titular Episcopal See of Talbora was renamed as Titular Episcopal See of Thabbora |
| 1925 | Tunisia | Titular Episcopal See of Tabraca was renamed as Titular Episcopal See of Thabraca |
| 1925 | Tunisia | Titular Episcopal See of Thacia Montana was renamed as Titular Episcopal See of Thacia Montana |
| 1925 | Tunisia | Titular Episcopal See of Thuburbo minus was renamed as Titular Episcopal See of Thuburbo minus |
| 1925 | Tunisia | Titular Episcopal See of Usula was renamed as Titular Episcopal See of Usula |
| 1925 |  Turkiye | Titular Archiepiscopal See of Adana was demoted as Titular Episcopal See of Adana |
| 1925 | Turkiye | Titular Episcopal See of Adrassus was renamed as Titular Episcopal See of Adrasus |
| 1925 | Turkiye | Titular Episcopal See of Aucanda was renamed as Titular Episcopal See of Arycanda |
| 1925 | Turkiye | Titular Archiepiscopal See of Attalia was demoted as Titular Episcopal See of Attalia |
| 1925 | Turkiye | Titular Episcopal See of Attudana was renamed as Titular Episcopal See of Attuda |
| 1925 | Turkiye | Titular Episcopal See of Batna (Syriac Rite) was renamed as Titular Episcopal See of Bahtna |
| 1925 | Turkiye | Titular Episcopal See of Berisa was renamed as Titular Episcopal See of Berissa |
| 1925 | Turkiye | Titular Episcopal See of Briula was established |
| 1925 | Turkiye | Titular Episcopal See of Chamacus was renamed as Titular Episcopal See of Camachus |
| 1925 | Turkiye | Titular Episcopal See of Cariopolis was renamed as Titular Episcopal See of Chariupulis |
| 1925 | Turkiye | Titular Episcopal See of Cibyra magna was renamed as Titular Episcopal See of Cibyra |
| 1925 | Turkiye | Titular Episcopal See of Cina was renamed as Titular Episcopal See of Cinna |
| 1925 | Turkiye | Titular Episcopal See of Colophonius was renamed as Titular Episcopal See of Colophon |
| 1925 | Turkiye | Titular Episcopal See of Comanæ was renamed as Titular Episcopal See of Comana Cappadociæ |
| 1925 | Turkiye | Titular Episcopal See of Comana Ponti was renamed as Titular Episcopal See of Comana Pontica |
| 1925 | Turkiye | Titular Episcopal See of Conana was established |
| 1925 | Turkiye | Titular Episcopal See of Corna was established |
| 1925 | Turkiye | Titular Episcopal See of Corydallus was renamed as Titular Episcopal See of Croydala |
| 1925 | Turkiye | Titular Episcopal See of Cocussus was renamed as Titular Episcopal See of Cucusus |
| 1925 | Turkiye | Titular Episcopal See of Cybistra postea Herculea was renamed as Titular Episcopal See of Cybistra |
| 1925 | Turkiye | Titular Metropolitan See of Cæsarea Ponti was renamed as Titular Metropolitan See of Cæsarea |
| 1925 | Turkiye | Titular Episcopal See of Dadima was established |
| 1925 | Turkiye | Titular Episcopal See of Danium was established |
| 1925 | Turkiye | Titular Episcopal See of Anastasiopolis was promoted as Titular Metropolitan See of Dara |
| 1925 | Turkiye | Titular Episcopal See of Delcus was suppressed |
| 1925 | Turkiye | Titular Episcopal See of Dercos was established |
| 1925 | Turkiye | Titular Episcopal See of Docimeum was renamed as Titular Episcopal See of Docimium |
| 1925 | Turkiye | Titular Episcopal See of Domitiopolis was renamed as Titular Episcopal See of Dometiupolis |
| 1925 | Turkiye | Titular Episcopal See of Dorylæum was renamed as Titular Episcopal See of Dorylaëum |
| 1925 | Turkiye | Titular Episcopal See of Druzipara was renamed as Titular Episcopal See of Druzipara |
| 1925 | Turkiye | Titular Episcopal See of Eriza was established |
| 1925 | Turkiye | Titular Archiepiscopal See of Eucaita was demoted as Titular Episcopal See of Eucaita |
| 1925 | Turkiye | Titular Episcopal See of Eudocias was renamed as Titular Episcopal See of Eudoxias |
| 1925 | Turkiye | Titular Episcopal See of Phaustinopolis was renamed as Titular Episcopal See of Faustinopolis |
| 1925 | Turkiye | Titular Episcopal See of Flaviopolis antea Cratea was renamed as Titular Episcopal See of Flaviopolis |
| 1925 | Turkiye | Titular Episcopal See of Germia s. Germocolonia was renamed as Titular Episcopal See of Germa |
| 1925 | Turkiye | Titular Archiepiscopal See of Germia was demoted as Titular Episcopal See of Germia |
| 1925 | Turkiye | Titular Episcopal See of Adriani was renamed as Titular Episcopal See of Hadriani ad Olympum |
| 1925 | Turkiye | Titular Episcopal See of Adrianopolis was renamed as Titular Episcopal See of Hadrianopolis |
| 1925 | Turkiye | Titular Metropolitan See of Adrianopolis was renamed as Titular Metropolitan See of Hadrianopolis |
| 1925 | Turkiye | Titular Episcopal See of Helenopolis was renamed as Titular Episcopal See of Helenopolis |
| 1925 | Turkiye | Titular Metropolitan See of Hierapolis was restored |
| 1925 | Turkiye | Titular Episcopal See of Iassus was renamed as Titular Episcopal See of Iasus |
| 1925 | Turkiye | Titular Episcopal See of Iboræ was renamed as Titular Episcopal See of Ibora |
| 1925 | Turkiye | Titular Archiepiscopal See of Irenopolis was demoted as Titular Episcopal See of Irenopolis |
| 1925 | Turkiye | Titular Episcopal See of Irenopolis was renamed as Titular Episcopal See of Irenopolis |
| 1925 | Turkiye | Titular Episcopal See of Isba was established |
| 1925 | Turkiye | Titular Episcopal See of Isionda was renamed as Titular Episcopal See of Isinda |
| 1925 | Turkiye | Titular Episcopal See of Isaura was renamed as Titular Episcopal See of Jsaura Nova |
| 1925 | Turkiye | Titular Episcopal See of Leuca was renamed as Titular Episcopal See of Leuce |
| 1925 | Turkiye | Titular Episcopal See of Lipara was established |
| 1925 | Turkiye | Titular Episcopal See of Lunda was established |
| 1925 | Turkiye | Titular Archiepiscopal See of Madystos was renamed as Titular Archiepiscopal See of Madytus |
| 1925 | Turkiye | Titular Episcopal See of Magnesia was renamed as Titular Episcopal See of Magnesia ad Mæandrum |
| 1925 | Turkiye | Titular Episcopal See of Magyddus was renamed as Titular Episcopal See of Magydus |
| 1925 | Turkiye | Titular Episcopal See of Mastaura was established |
| 1925 | Turkiye | Titular Metropolitan See of Mocissus was renamed as Titular Metropolitan See of Mocissus |
| 1925 | Turkiye | Titular Episcopal See of Mylassa was renamed as Titular Episcopal See of Mylasa |
| 1925 | Turkiye | Titular Archiepiscopal See of Myra (Greek-Melkite Rite) was suppressed |
| 1925 | Turkiye | Titular Episcopal See of Myriophytos was renamed as Titular Episcopal See of Myriophytos |
| 1925 | Turkiye | Titular Archiepiscopal See of Nacolea was demoted as Titular Episcopal See of Nacolia |
| 1925 | Turkiye | Titular Archiepiscopal See of Nazianzus was demoted as Titular Episcopal See of Nazianzus |
| 1925 | Turkiye | Titular Episcopal See of Olimpus was renamed as Titular Episcopal See of Olympus |
| 1925 | Turkiye | Titular Episcopal See of Paleopolis was renamed as Titular Episcopal See of Palæopolis |
| 1925 | Turkiye | Titular Archiepiscopal See of Parium was demoted as Titular Episcopal See of Parium |
| 1925 | Turkiye | Titular Episcopal See of Paralais was renamed as Titular Episcopal See of Parlais |
| 1925 | Turkiye | Titular Episcopal See of Pednelissus was renamed as Titular Episcopal See of Pednelissus |
| 1925 | Turkiye | Titular Episcopal See of Pergamus was renamed as Titular Episcopal See of Pergamum |
| 1925 | Turkiye | Titular Episcopal See of Petra was renamed as Titular Episcopal See of Perrhe |
| 1925 | Turkiye | Titular Episcopal See of Petenissus was renamed as Titular Episcopal See of Petinissus |
| 1925 | Turkiye | Titular Episcopal See of Phoba was established |
| 1925 | Turkiye | Titular Episcopal See of Podalia was established |
| 1925 | Turkiye | Titular Episcopal See of Polemonium was renamed as Titular Episcopal See of Polemonium |
| 1925 | Turkiye | Titular Archiepiscopal See of Pompeiopolis was demoted as Titular Episcopal See of Pompeiopolis |
| 1925 | Turkiye | Titular Episcopal See of Prusias was renamed as Titular Episcopal See of Prusias ad Hypium |
| 1925 | Turkiye | Titular Episcopal See of Rhizus was renamed as Titular Episcopal See of Rhizæum |
| 1925 | Turkiye | Titular Episcopal See of Rhodiopolis was renamed as Titular Episcopal See of Rhodiapolis |
| 1925 | Turkiye | Titular Episcopal See of Rhosus was renamed as Titular Episcopal See of Rhosus |
| 1925 | Turkiye | Titular Episcopal See of Sabadia was established |
| 1925 | Turkiye | Titular Episcopal See of Sala was established |
| 1925 | Turkiye | Titular Episcopal See of Soatra was renamed as Titular Episcopal See of Savatra |
| 1925 | Turkiye | Titular Metropolitan See of Sebastia was renamed as Titular Metropolitan See of Sebastea |
| 1925 | Turkiye | Titular Metropolitan See of Seleucia Trachea was renamed as Titular Metropolitan See of Seleucia |
| 1925 | Turkiye | Titular Archiepiscopal See of Seleucia Pieria was demoted as Titular Episcopal See of Seleucia pieria |
| 1925 | Turkiye | Titular Episcopal See of Sion was suppressed |
| 1925 | Turkiye | Titular Metropolitan See of Synnadæ was renamed as Titular Metropolitan See of Synnada |
| 1925 | Turkiye | Titular Episcopal See of Tabala was established |
| 1925 | Turkiye | Titular Episcopal See of Tarsus (Maronite Rite) was suppressed |
| 1925 | Turkiye | Titular Episcopal See of Telmissus was renamed as Titular Episcopal See of Telmissus |
| 1925 | Turkiye | Titular Episcopal See of Theodoropolis was renamed as Titular Episcopal See of Theodorium |
| 1925 | Turkiye | Titular Episcopal See of Theodoropolis (Greek Rite) was renamed as Titular Episcopal See of Theodorium |
| 1925 | Turkiye | Titular Episcopal See of Thymbrium was renamed as Titular Episcopal See of Timbriada |
| 1925 | Turkiye | Titular Episcopal See of Titopolis was renamed as Titular Episcopal See of Titiupolis |
| 1925 | Turkiye | Titular Archiepiscopal See of Trapezus was demoted as Titular Episcopal See of Trapezus |
| 1925 | Turkiye | Titular Episcopal See of Trebenna was established |
| 1925 | Turkiye | Titular Episcopal See of Trocmadæ was renamed as Titular Episcopal See of Trocmades |
| 1925 | Turkiye | Titular Metropolitan See of Tianæ was renamed as Titular Metropolitan See of Tyana |
| 1925 | Turkiye | Titular Episcopal See of Æzani was renamed as Titular Episcopal See of Æzanis |
| 1925 |  Ukraine | Titular Archiepiscopal See of Chersona was renamed as Titular Archiepiscopal See of Cherson |
| 1925 | Titular Episcopal See of Augila was suppressed | |
| 1925 | Titular Episcopal See of Axiopolis was suppressed | |
| 1925 | Titular Episcopal See of Bethelea was established | |
| 1925 | Titular Episcopal See of Bethsaida was suppressed | |
| 1925 | Titular Episcopal See of Bodona was suppressed | |
| 1925 | Titular Episcopal See of Etalonia was suppressed | |
| 1925 | Titular Episcopal See of Ioppe (Syriac Rite) was suppressed | |
| 1925 | Titular Episcopal See of Oropus was renamed as Titular Episcopal See of Oropus | |
| 1925 | Titular Episcopal See of Parœcopolis was renamed as Titular Episcopal See of Parœcopolis | |
| 1925 | Titular Episcopal See of Possala was established | |
| 1925 | Titular Episcopal See of Tenara was renamed as Titular Episcopal See of Thenara | |
| 1925 | Titular Episcopal See of Usada was established | |
| 1925.01.06 |  Cuba | Diocese of La Habana was promoted as Metropolitan Archdiocese of La Habana (with suffragan sees Matanzas and Pinar del Río) |
| 1925.02.11 |  China | Apostolic Prefecture of Qingdao 青島 was established (from Apostolic Vicariate of Yanzhoufu 兗州府) |
| 1925.02.12 |  Paraguay | Apostolic Prefecture of Pilcomayo was established (from Apostolic Vicariate of Chaco) |
| 1925.02.13 | Ethiopia | Apostolic Vicariate of Galla lost territory to Apostolic Prefecture of Djibouti |
| 1925.03 | Jordan | Titular Archiepiscopal See of Areopolis was demoted as Titular Episcopal See of Areopolis |
| 1925.03.06 |  Italy | Military Vicariate of Italy was established |
| 1925.03.13 | China | Apostolic Prefecture of Chenzhou 辰州 was established (from Apostolic Vicariate of Changde 常德) |
| 1925.03.27 |  Brazil | Diocese of Valença was established (from Diocese of Barra do Piraí and became suffragan of São Sebastião do Rio de Janeiro) |
| 1925.04.15 |  Belgium | Diocese of Eupen–Malmedy was suppressed (to Diocese of Liège) |
| 1925.04.25 | Croatia | Apostolic Administration of Fiume was promoted as Diocese of Rijeka–Opatija (gained territory from Diocese of Ljubljana, Diocese of Senj–Modruš and Diocese of Trieste and without ecclesiastical province) |
| 1925.04.25 | Croatia | Diocese of Senj–Modruš lost territory to Diocese of Rijeka–Opatija |
| 1925.04.25 | Italy | Diocese of Trieste lost territory to Diocese of Rijeka–Opatija |
| 1925.04.25 |  Slovenia | Diocese of Ljubljana lost territory to Diocese of Rijeka–Opatija |
| 1925.05.01 | Brazil | Territorial Prelature of Lábrea was established (from Diocese of Amazonas and became suffragan of Belém do Pará) |
| 1925.05.01 | Brazil | Territorial Prelature of Porto Velho was established (from Diocese of Amazonas and Diocese of São Luiz de Cáceres and became suffragan of Belém do Pará) |
| 1925.05.01 | Brazil | Apostolic Prefecture of Rio Negro was promoted as Territorial Prelature of Rio Negro (became suffragan of Belém do Pará) |
| 1925.05.12 | China | Apostolic Prefecture of Yongzhoufu 永州府 was established (from Apostolic Vicariate of Changsha 長沙) |
| 1925.05.12 |  Congo-Kinshasa | Apostolic Prefecture of Luapula Supérieur was established (from Apostolic Prefecture of Katanga) |
| 1925.05.31 |  Tanzania | Apostolic Vicariate of Unianyembé was renamed as Apostolic Vicariate of Tabora |
| 1925.06.03 | Italy | Diocese of Poggio Mirteto was suppressed (to Diocese of Rieti and Diocese of Sabina e Poggio Mirteto) |
| 1925.06.03 | Italy | Diocese of Sabina was renamed as Diocese of Sabina e Poggio Mirteto (gained territory from the suppressed Diocese of Poggio Mirteto) |
| 1925.07.14 |  Peru | Apostolic Prefecture of Ucayali was promoted as Apostolic Vicariate of Ucayali |
| 1925.07.15 |  Canada | Apostolic Prefecture of Baie d’Hudson was established (from Apostolic Vicariate of Keewatin and became suffragan of Saint-Boniface) |
| 1925.07.15 |  Kenya | Apostolic Prefecture of Kavirondo was established (from Apostolic Vicariate of Upper Nile) |
| 1925.07.24 | Brazil | Diocese of Bragança Paulista was established (from Metropolitan Archdiocese of São Paulo and Diocese of Campinas and became suffragan of São Paulo) |
| 1925.10.18 |  Chile | Diocese of Chillán was established (from Diocese of Concepción and became suffragan of Santiago) |
| 1925.10.18 | Chile | Diocese of Linares was established (from Diocese of Concepción and became suffragan of Santiago) |
| 1925.10.18 | Chile | Diocese of Rancagua was established (from Metropolitan Archdiocese of Santiago and became suffragan of Santiago) |
| 1925.10.18 | Chile | Diocese of San Felipe was established (from Metropolitan Archdiocese of Santiago and became suffragan of Santiago) |
| 1925.10.18 | Chile | Diocese of Talca was established (from Metropolitan Archdiocese of Santiago and became suffragan of Santiago) |
| 1925.10.18 | Chile | Diocese of Temuco was established (from Diocese of Concepción and became suffragan of Santiago) |
| 1925.10.18 | Chile | Mission sui juris of Valparaíso was promoted as Diocese of Valparaíso |
| 1925.10.28 |  Belarus | Diocese of Pinsk was established (from Diocese of Minsk and became suffragan of Vilnius) |
| 1925.10.28 |  Lithuania | Diocese of Vilnius was promoted as Metropolitan Archdiocese of Vilnius (with suffragan sees Łomża and Pinsk) |
| 1925.10.28 |  Poland | Diocese of Augustów was suppressed (to establish Diocese of Łomża) |
| 1925.10.28 | Poland | Diocese of Częstochowa was established (from Diocese of Kielce, Diocese of Łódź and Diocese of Wrocław and became suffragan of Kraków) |
| 1925.10.28 | Poland | Apostolic Administration of Upper Silesia was promoted as Diocese of Katowice (became suffragan of Kraków) |
| 1925.10.28 | Poland | Diocese of Kielce lost territory to Metropolitan Archdiocese of Kraków |
| 1925.10.28 | Poland | Diocese of Kraków was promoted as Metropolitan Archdiocese of Kraków (with suffragan sees Częstochowa, Katowice, Kielce and Tarnów and gained territory from Diocese of Kielce, Diocese of Spiš and Diocese of Tarnów) |
| 1925.10.28 | Poland | Diocese of Przemyśl exchanged territory with Diocese of Tarnów |
| 1925.10.28 | Poland | Diocese of Płock lost territory to Diocese of Łomża |
| 1925.10.28 | Poland | Diocese of Podlachia was renamed as Diocese of Siedlce |
| 1925.10.28 | Poland | Diocese of Tarnów lost territory to Metropolitan Archdiocese of Kraków |
| 1925.10.28 | Poland | Metropolitan Archdiocese of Warszawa lost territory to Diocese of Łomża |
| 1925.10.28 | Poland | Diocese of Kujawy–Kaliska was renamed as Diocese of Włocławek (became suffragan of Gniezno) |
| 1925.10.28 | Poland | Diocese of Łomża was established (from the suppressed Diocese of Augustów, gained territory from Metropolitan Archdiocese of Warszawa and Diocese of Płock and became suffragan of Vilnius) |
| 1925.10.28 |  Slovakia | Diocese of Spiš lost territory to Metropolitan Archdiocese of Kraków |
| 1925.10.28 | Ukraine | Diocese of Lutsk and Zytomierz was renamed as Diocese of Lutsk (lost territory to establish Diocese of Žytomyr and became suffragan of Lviv) |
| 1925.10.28 | Ukraine | Diocese of Žytomyr was restored (from Diocese of Lutsk and Zytomierz) |
| 1925.11.29 |  Panama | Apostolic Vicariate of Darién was established (from Diocese of Panamá) |
| 1925.11.29 | Panama | Diocese of Panamá was promoted as Archdiocese of Panamá (lost territory to establish Apostolic Vicariate of Darién and without ecclesiastical province) |
| 1925.12.11 |  Austria | Apostolic Administration of Innsbruck–Feldkirch was established (from Diocese of Brixen) |
| 1925.12.15 |  Belize | Apostolic Vicariate of British Honduras was renamed as Apostolic Vicariate of Belize |
| 1925.12.15 |  Norway,  Bouvet Island | Apostolic Vicariate of Norway and Spitzbergen was renamed as Apostolic Vicariate of Norway |
| 1925.12.21 | Greece | Ordinariate of Greece (Armenian Rite) was established |
| 1925.12.30 | Poland | Apostolic Administration of Gdańsk was promoted as Diocese of Gdańsk (without ecclesiastical province) |
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