 | 8ᵗʰ century | 9ᵗʰ century | 10ᵗʰ century |  |
| 8ᵗʰ century | 9ᵗʰ century | 10ᵗʰ century | |
Date | Country | Change |
| 801 |  Spain | Diocese of Barcelona was restored |
| 802 |  Germany | Diocese of Neuburg was suppressed (to Diocese of Augsburg) |
| 803 |  England | Metropolitan Archdiocese of Lichfield was demoted as Diocese of Lichfield |
| 803 | Germany | Diocese of Minden was established (became suffragan of Köln) |
| 804 |  Italy | Diocese of Mantova was established (from Diocese of Verona and became suffragan of Aquileia) |
| 805 | Germany | Diocese of Halberstadt was established (became suffragan of Mainz) |
| 810 | Spain | Diocese of Sigüenza was suppressed |
| 811 |  Croatia | Diocese of Cittanova lost territory to Patriarchal See of Aquileia |
| 811 | Spain | Diocese of Oviedo was established (from Metropolitan Archdiocese of Lugo) |
| 815 | Germany | Diocese of Hildesheim was established (became suffragan of Mainz) |
| 820 | Italy | Diocese of Massa Marittima e Populonia was established (from the suppressed Diocese of Populonia) |
| 820 | Italy | Diocese of Populonia was suppressed (to establish Diocese of Massa Marittima e Populonia) |
| 824 |  France | Diocese of Accia was established (from Diocese of Aléria and Diocese of Mariana) |
| 827 | Italy | Diocese of Carini was suppressed |
| 831 | Germany | Metropolitan Archdiocese of Hamburg was established (from Diocese of Bremen) |
| 835 | Italy | Diocese of Agrigento was suppressed |
| 837 | Italy | Diocese of Tricala was suppressed |
| 844 | Italy | Diocese of Canosa lost territory to Diocese of Trani |
| 844 | Italy | Diocese of Sepino was suppressed |
| 846 | Italy | Diocese of Formia was suppressed (to establish Diocese of Gaeta) |
| 846 | Italy | Diocese of Gaeta was established (from the suppressed Diocese of Formia and without ecclesiastical province) |
| 848 | France | Metropolitan Archdiocese of Dol was established (from Diocese of Aleth) |
| 848 | France | Diocese of Saint-Brieuc was established (from Diocese of Aleth and became suffragan of Tours) |
| 848 | France | Diocese of Tréguier was established (from Diocese of Aleth and became suffragan of Tours) |
| 850 | Croatia | Diocese of Nona was established |
| 850 |  Scotland | Diocese of Saint Andrews was established |
| 850 | Spain | Diocese of Astorga lost territory to Diocese of León |
| 851 | France | Diocese of Rezé was suppressed (to Diocese of Nantes) |
| 866 | Spain | Diocese of San Martiño de Mondoñedo was established (from Metropolitan Archdiocese of Lugo and Diocese of Oviedo and became suffragan of Lugo) |
| 870 | England | Diocese of Elmham was suppressed (to Diocese of Dunwich) |
| 870 | Italy | Diocese of Cefalù was suppressed |
| 870 | Italy | Diocese of Otranto was promoted as Archdiocese of Otranto |
| 870 | Italy | Diocese of Tre Taverne was suppressed (to Diocese of Velletri) |
| 870 | Spain | Diocese of Armentia was established (from Diocese of Calahorra) |
| 870 | Spain | Diocese of Álava was established (from Diocese of Calahorra) |
| 875 | England | Diocese of Leicester was renamed as Diocese of Dorchester |
| 875 |  Portugal | Diocese of Viseu was restored (became suffragan of Braga) |
| 878 | Italy | Diocese of Alesa was suppressed |
| 878 | Italy | Diocese of Lipari was suppressed |
| 878.05.21 | Italy | Metropolitan Archdiocese of Siracusa was suppressed |
| 879 | France | Diocese of Auch was promoted as Metropolitan Archdiocese of Auch (with suffragan sees Aire, Bayonne, Bazas, Couserans, Dax, Lectoure, Lescar, Oloron, Saint-Bertrand-de-Comminges and Tarbes and gained territory from the suppressed Metropolitan Archdiocese of Eauze) |
| 879 | France | Metropolitan Archdiocese of Eauze was suppressed (to Metropolitan Archdiocese of Auch) |
| 880 | Italy | Diocese of Catania was suppressed |
| 880 | Italy | Diocese of Lentini was suppressed |
| 880 | Italy | Diocese of Messina was suppressed |
| 880 | Italy | Diocese of Tindari was suppressed |
| 880 | Portugal | Diocese of Lamego was restored (became suffragan of Braga) |
| 880.06 |  Slovakia | Diocese of Nitra was established (from Diocese of Regensburg) |
| 881 | Portugal | Diocese of Portucale was restored (became suffragan of Braga) |
| 883 | England | Diocese of Cunecaster was established (from the suppressed Diocese of Hexham and Diocese of Lindisfarne) |
| 883 | England | Diocese of Hexham was suppressed (to establish Diocese of Cunecaster) |
| 883 | England | Diocese of Lindisfarne was suppressed (to establish Diocese of Cunecaster) |
| 884 | France | Diocese of Léon was established (from Diocese of Quimper and became suffragan of Tours) |
| 885 | Italy | Metropolitan Archdiocese of Santa Severina was established (from Diocese of Crotone and with suffragan see Gallipoli) |
| 885.04.06 |  Serbia | Metropolitan Archdiocese of Srijem was suppressed |
| 886 | Spain | Diocese of Ourense was restored (from Metropolitan Archdiocese of Lugo and became suffragan of Lugo) |
| 886 | Spain | Diocese of Vic was restored (became suffragan of Narbonne) |
| 887 | Spain | Diocese of Lérida was suppressed (to establish Diocese of Pallars–Ribagorça) |
| 887 | Spain | Diocese of Osca was suppressed (to Diocese of Pamplona and to establish Diocese of Pallars–Ribagorça) |
| 887 | Spain | Diocese of Pallars–Ribagorça was established (from Diocese of Urgell and from the suppressed Diocese of Lérida and Diocese of Osca) |
| 890 | Italy | Diocese of Gabi was suppressed (to Diocese of Palestrina) |
| 890 | Italy | Diocese of Termini Imerese was suppressed |
| 890 | Spain | Diocese of Tui was restored (became suffragan of Lugo) |
| 893 | Italy | Diocese of Bovino was suppressed (to Diocese of Benevento) |
| 900 |  Albania | Diocese of Pult was established (became suffragan of Doclea) |
| 900 | Croatia | Diocese of Krk was established (became suffragan of Split) |
| 900 | France | Diocese of Poitiers lost territory to Diocese of Angers |
| 900 |  Greece | Diocese of Anastasiopolis was suppressed |
| 900 | Greece | Diocese of Tinos was established |
| 900 |  Ireland | Diocese of Cashel was established (from Diocese of Emly) |
| 900 | Italy | Diocese of Amantea was established (became suffragan of Reggio Calabria) |
| 900 | Italy | Diocese of Bevagna was suppressed (to Diocese of Spoleto) |
| 900 | Italy | Diocese of Canne was established |
| 900 | Italy | Diocese of Eraclea was suppressed (to Diocese of Belluno) |
| 900 | Italy | Diocese of Santa Ciriaca was renamed as Diocese of Locri |
| 900 | Italy | Diocese of Marsi was established |
| 900 | Italy | Diocese of Matera was established (from Diocese of Acerenza) |
| 900 | Italy | Diocese of Milazzo was suppressed |
| 900 | Italy | Diocese of Minervino was established |
| 900 | Italy | Diocese of Monterano was suppressed (to Diocese of Sutri) |
| 900 | Italy | Diocese of Nicastro was established (became suffragan of Reggio Calabria) |
| 900 | Italy | Diocese of Orvieto lost territory to Diocese of Bagnoregio |
| 900 | Italy | Diocese of Perugia lost territory to Diocese of Bagnoregio |
| 900 | Italy | Abbacy nullius of San Colombano lost territory to Diocese of Tortona |
| 900 | Italy | Diocese of Spello was suppressed (to Diocese of Spoleto) |
| 900 |  Montenegro | Diocese of Budua was established (became suffragan of Doclea) |
| 900 | Montenegro | Diocese of Svač was established (became suffragan of Doclea) |
| 900 |  Palestine | Diocese of Maiumas Gazæ was suppressed |
| 900 | Spain | Diocese of Badajoz was established (from the suppressed Metropolitan Archdiocese of Emerita Augusta) |
| 900 | Spain | Diocese of Baeza was suppressed |
| 900 | Spain | Diocese of Egabro was suppressed |
| 900 | Spain | Metropolitan Archdiocese of Emerita Augusta was suppressed (to establish Diocese of Badajoz) |
| 900 | Spain | Diocese of Zamora was established |
| 900 |  Syria | Metropolitan Archdiocese of Hemesa was suppressed |
| 900 |  Turkiye | Diocese of Achyraus was suppressed |
| 900 | Turkiye | Diocese of Apollonias was suppressed |
| 900 | Turkiye | Diocese of Charræ was suppressed |
| 900 | Turkiye | Archdiocese of Colonia was suppressed |
| 900 | Turkiye | Diocese of Eumenia was suppressed |
| 900 | Turkiye | Metropolitan Archdiocese of Martiropolis was suppressed |
| 900 | Turkiye | Archdiocese of Nazianzus was suppressed |
| 900 | Turkiye | Metropolitan Archdiocese of Synnadæ was suppressed |
| 900 | Turkiye | Diocese of Thyatira was suppressed |
| 900 | Turkiye | Diocese of Troas was suppressed |
| 8ᵗʰ century | 9ᵗʰ century | 10ᵗʰ century | |
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