 | 13ᵗʰ century | 14ᵗʰ century | 15ᵗʰ century |  |
| 13ᵗʰ century | 14ᵗʰ century | 15ᵗʰ century | |
Date | Country | Change |
| 1304 |  Italy | Diocese of Nicotera was suppressed (to Diocese of Mileto) |
| 1306 |  Ireland | Diocese of Annaghdown was restored (from Metropolitan Archdiocese of Tuam and became suffragan of Tuam) |
| 1306 |  Spain | Titular Episcopal See of Baza was restored |
| 1307 |  China | Metropolitan Archdiocese of Khanbalik 汗八里 was established |
| 1307.07.23 | China | Titular Patriarchal See of All the East 遠東 was established |
| 1308.08.03 |  France | Diocese of Pamiers lost territory to Diocese of Toulouse |
| 1310 | Italy | Diocese of Mileto lost territory to Metropolitan Archdiocese of Reggio Calabria |
| 1313 | China | Diocese of Citong 刺桐 was established (from Metropolitan Archdiocese of Khanbalik 汗八里 and became suffragan of Khanbalik 汗八里) |
| 1317.07.09 | France | Diocese of Saint-Flour was established (from Diocese of Clermont and became suffragan of Bourges) |
| 1317.07.11 | France | Diocese of Castres was established (from Diocese of Albi and became suffragan of Bourges) |
| 1317.07.11 | France | Diocese of Condom was established (from Diocese of Agen and became suffragan of Bordeaux) |
| 1317.07.11 | France | Diocese of Maillezais was established (from Diocese of Poitiers and became suffragan of Bordeaux) |
| 1317.07.11 | France | Diocese of Montauban was established (from Diocese of Cahors and Diocese of Toulouse and became suffragan of Toulouse) |
| 1317.07.11 | France | Diocese of Rieux was established (from Diocese of Pamiers and became suffragan of Toulouse) |
| 1317.07.11 | France | Diocese of Saint-Papoul was established (from Diocese of Toulouse) |
| 1317.07.11 | France | Diocese of Toulouse was promoted as Metropolitan Archdiocese of Toulouse (with suffragan sees Montauban, Pamiers and Rieux and lost territory to establish Diocese of Montauban and Diocese of Saint-Papoul) |
| 1317.08.13 | France | Diocese of Tulle was established (from Diocese of Limoges and became suffragan of Bourges) |
| 1317.08.13 | France | Diocese of Vabres was established (from Diocese of Rodez and became suffragan of Bourges) |
| 1317.08.16 | France | Diocese of Lombez was established (from Metropolitan Archdiocese of Toulouse and became suffragan of Toulouse) |
| 1317.08.16 | France | Diocese of Luçon was established (from Diocese of Poitiers and became suffragan of Bordeaux) |
| 1317.08.17 | France | Diocese of Sarlat was established (from Diocese of Périgueux and became suffragan of Bordeaux) |
| 1317.08.20 | France | Diocese of Limoux was established (from Metropolitan Archdiocese of Narbonne and became suffragan of Narbonne) |
| 1317.09.26 | France | Diocese of Mirepoix was established (from Diocese of Pamiers and became suffragan of Toulouse) |
| 1318 |  Armenia,  Azerbaijan | Diocese of Nachitschewan was established |
| 1318 |  Ukraine | Diocese of Caffa was established (became suffragan of Genova) |
| 1318.02.22 | France | Diocese of Lavaur was established (from Metropolitan Archdiocese of Toulouse and became suffragan of Toulouse) |
| 1318.02.28 | France | Diocese of Alet was established (from Metropolitan Archdiocese of Narbonne and became suffragan of Narbonne) |
| 1318.02.28 | France | Diocese of Limoux was suppressed (to Metropolitan Archdiocese of Narbonne) |
| 1318.02.28 | France | Diocese of Saint-Pons-de-Thomières was established (from Metropolitan Archdiocese of Narbonne and became suffragan of Narbonne) |
| 1318.04.01 |  Iran | Metropolitan Archdiocese of Soltania was established |
| 1318.06.14 | Spain | Diocese of Zaragoza was promoted as Metropolitan Archdiocese of Zaragoza (with suffragan sees Calahorra y La Calzada, Huesca–Jaca, Pamplona and Tarazona) |
| 1320 | China | Diocese of Ili-baluc 亦力把里 was established (from Metropolitan Archdiocese of Khanbalik 汗八里 and became suffragan of Khanbalik 汗八里) |
| 1320 | Italy | Diocese of Osimo was renamed as Diocese of Osimo e Cingoli |
| 1320.11.18 | Italy | Diocese of Macerata was established (from Diocese of Camerino and Diocese of Fermo and from the suppressed Diocese of Recanati) |
| 1320.11.18 | Italy | Diocese of Recanati was suppressed (to establish Diocese of Macerata) |
| 1321 |  Russia | Metropolitan Archdiocese of Saraj was established |
| 1321 | Ukraine | Diocese of Kyiv was established |
| 1321 | Ukraine | Diocese of Žytomyr was established |
| 1322.05.02 | Italy | Abbacy nullius of Montecassino was promoted as Diocese of Montecassino |
| 1325.06.19 | Italy | Diocese of Cortona was established (from Diocese of Arezzo, Diocese of Chiusi and Diocese of Città di Castello) |
| 1327 | Italy | Metropolitan Archdiocese of Nazareth in Barletta was established (from Metropolitan Archdiocese of Trani and from the suppressed Metropolitan Archdiocese of Nazareth) |
| 1327 |  Palestine | Metropolitan Archdiocese of Nazareth was suppressed (to establish Metropolitan Archdiocese of Nazareth in Barletta) |
| 1329.08.09 |  Georgia | Diocese of Tiflis was established |
| 1329.08.09 |  India | Diocese of Quilon was established (became suffragan of Soltania) |
| 1329.08.13 |  Uzbekistan | Diocese of Samarcanda was established |
| 1330 | China | Diocese of Ili-baluc 亦力把里 was suppressed |
| 1330 |  Sudan | Diocese of Dongola was established |
| 1333 |  Greece | Diocese of Kea–Kythnos–Sifnos was established |
| 1334 | Italy | Diocese of Eraclea lost territory to Diocese of Treviso |
| 1337 | France | Diocese of Sospel was established (from Diocese of Ventimiglia) |
| 1340.04 |  Poland | Diocese of Przemyśl was established |
| 1344 |  Croatia | Diocese of Makarska was restored (from Metropolitan Archdiocese of Split) |
| 1344 | Spain | Diocese of Algeciras was established (from Diocese of Cádiz) |
| 1344.04.30 |  Czechia | Diocese of Litomyšl was established (from Diocese of Praha) |
| 1344.08.25 | Czechia | Diocese of Praha was promoted as Metropolitan Archdiocese of Praha (with suffragan sees Litomyšl and Olomouc) |
| 1345 | Greece | Titular Metropolitan See of Thessalonica was restored |
| 1346 |  Turkiye | Archdiocese of Smirne was established |
| 1347 | Spain | Diocese of Valencia lost territory to Diocese of Segorbe–Albarracín |
| 1349.02.21 | Russia | Metropolitan Archdiocese of Matriga was established |
| 1350 | Sudan | Diocese of Dongola was suppressed |
| 1350 | Ukraine | Diocese of Cembalo was established (became suffragan of Saraj) |
| 1351.11.07 | Spain | Diocese of Islas de la Fortuna was established (from Diocese of Mallorca and became suffragan of Sevilla) |
| 1356 | Georgia | Diocese of Tiflis was suppressed |
| 1356.01.08 | Italy | Diocese of Recanati was restored (from Diocese of Macerata) |
| 1357 |  Cyprus | Archdiocese of Cyprus (Maronite Rite) was established (without ecclesiastical province) |
| 1358 | Poland | Diocese of Chełm was restored (became suffragan of Gniezno) |
| 1358 | Ukraine | Diocese of Lviv was established |
| 1360 | Italy | Diocese of Bertinoro was established (from the suppressed Diocese of Forlimpopoli) |
| 1360 | Italy | Diocese of Forlimpopoli was suppressed (to establish Diocese of Bertinoro) |
| 1361 |  Bosnia and Herzegovina | Diocese of Trebinje was renamed as Diocese of Mrkan |
| 1361 | Ukraine | Diocese of Halyč was established |
| 1363.06.16 | Ireland | Diocese of Lismore was suppressed (to Diocese of Waterford and Lismore) |
| 1363.06.16 | Ireland | Diocese of Waterford was renamed as Diocese of Waterford and Lismore (gained territory from the suppressed Diocese of Lismore) |
| 1364 | Poland | Diocese of Kraków lost territory to Metropolitan Archdiocese of Gniezno |
| 1367.03.31 | Italy | Diocese of Montecassino was demoted as Territorial Abbacy of Montecassino |
| 1368.07.12 | Italy | Diocese of Osimo e Cingoli was renamed as Diocese of Osimo |
| 1369 | Spain | Diocese of Islas de la Fortuna was renamed as Diocese of Telde |
| 1369.08.31 | Italy | Diocese of Montefiascone was established (from Diocese of Bagnoregio, Diocese of Castro del Lazio, Diocese of Orvieto, Diocese of Tuscanella and Diocese of Viterbo) |
| 1370 | China | Titular Patriarchal See of All the East 遠東 was suppressed |
| 1370 | China | Diocese of Citong 刺桐 was suppressed |
| 1370 | Russia | Metropolitan Archdiocese of Saraj was suppressed |
| 1371 |  Romania | Diocese of Siret was established (without ecclesiastical province) |
| 1375 |  Algeria | Titular Episcopal See of Hippo Regius was restored |
| 1375 | China | Metropolitan Archdiocese of Khanbalik 汗八里 was suppressed |
| 1375.02.13 | Ukraine | Diocese of Halyč was promoted as Metropolitan Archdiocese of Halyč (with suffragan sees Kamyanets-Podilskyi, Lodomeria and Przemyśl and lost territory to establish Diocese of Lodomeria) |
| 1375.02.13 | Ukraine | Diocese of Kamyanets-Podilskyi was established (became suffragan of Halyč) |
| 1375.02.13 | Ukraine | Diocese of Lodomeria was established (from Diocese of Halyč and became suffragan of Halyč) |
| 1381 | Romania | Diocese of Argeș was established (became suffragan of Kalocsa) |
| 1384.10.10 | Italy | Diocese of Nuceria was restored (from Metropolitan Archdiocese of Amalfi and Metropolitan Archdiocese of Salerno and became suffragan of Salerno) |
| 1386 | Italy | Collegiate nullius of Colle di Val d’Elsa was established (from Diocese of Volterra) |
| 1387 |  Isle of Man | Diocese of Man was restored (from Diocese of Sodor) |
| 1388 |  Lithuania | Diocese of Vilnius was established (became suffragan of Gniezno) |
| 1388.06.05 | Italy | Diocese of Mondovì was established (from Diocese of Asti and became suffragan of Milano) |
| 1390 | Ukraine | Diocese of Soldaia was established |
| 1391 | Bosnia and Herzegovina | Diocese of Mrkan was renamed as Diocese of Trebinje–Mrkan |
| 1392.08.14 | Italy | Diocese of Nicotera was restored (from Metropolitan Archdiocese of Reggio Calabria and became suffragan of Reggio Calabria) |
| 1393.11.10 |  Portugal | Diocese of Lisboa was promoted as Metropolitan Archdiocese of Lisboa (with suffragan see Silves) |
| 1394.08.07 | Italy | Diocese of Cava was established (from Metropolitan Archdiocese of Salerno and without ecclesiastical province) |
| 1400 |  Albania | Diocese of Butrinto was suppressed |
| 1400 | Albania | Diocese of Craina was established |
| 1400 | Albania | Metropolitan Archdiocese of Durrës was demoted as Archdiocese of Durrës |
| 1400 | Albania | Diocese of Lezhë was established (became suffragan of Bar) |
| 1400 | Croatia | Diocese of Makarska was suppressed (to Metropolitan Archdiocese of Split) |
| 1400 | Greece | Diocese of Lango was suppressed |
| 1400 | Greece | Diocese of Naxos was established |
| 1400 | Greece | Archdiocese of Patrae Veteres was established |
| 1400 | Greece | Diocese of Tinos was renamed as Diocese of Tinos–Mykonos |
| 1400 | Iran | Diocese of Diargorgan was suppressed |
| 1400 |  Jordan | Titular Metropolitan See of Petra was restored |
| 1400 |  Latvia | Titular Episcopal See of Semgallia was suppressed |
| 1400 |  Libya | Titular Episcopal See of Cyrene was restored |
| 1400 |  North Macedonia | Diocese of Dardania was suppressed |
| 1400 | Russia | Metropolitan Archdiocese of Matriga was suppressed |
| 1400 | Spain | Titular Episcopal See of Guadix was established (from former Diocese of Acci) |
| 1400 | Turkiye | Titular Metropolitan See of Edessa was restored |
| 1400 | Turkiye | Diocese of Focea was established |
| 1400 | Turkiye | Titular Episcopal See of Magyddus was restored |
| 1400 | Turkiye | Archdiocese of Mopsuestia was suppressed |
| 1400 | Turkiye | Titular Metropolitan See of Myra was restored |
| 1400 | Turkiye | Titular Metropolitan See of Nicæa was restored |
| 1400 | Turkiye | Metropolitan Archdiocese of Sardes was demoted as Titular Metropolitan See of Sardes |
| 1400 | Turkiye | Diocese of Sinope was suppressed |
| 1400 | Turkiye | Titular Episcopal See of Troas was restored |
| 1400 | Uzbekistan | Diocese of Samarcanda was suppressed |
| 1400 | Titular Episcopal See of Dariensis was established | |
| 1400 | Titular Episcopal See of Dschebail was established |
| 13ᵗʰ century | 14ᵗʰ century | 15ᵗʰ century | |
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