| Date | From | To | ||
|---|---|---|---|---|
| unknown | Canons Regular of the Congregation of Saint Victor | Founded | ||
| unknown | Order of Hermits of St. Augustine | Name Changed | Order of St. Augustine | Name Changed |
| unknown | Titular See of Methamaucum | Suppressed | ||
| unknown | Titular See of Scala | Established | ||
| unknown | Titular See of Dolia | Established | ||
| unknown | Titular See of Sorres | Established | ||
| unknown | Titular See of Suelli | Established | ||
| unknown | Titular See of Caere | Established | ||
| unknown | Titular See of Alexanum | Established | ||
| unknown | Titular See of Labicum | Established | ||
| unknown | Titular See of Santa Giusta | Established | ||
| unknown | Titular See of Vibo | Established | ||
| unknown | Titular See of Vico Equense | Established | ||
| unknown | Titular See of Cures Sabinorum | Established | ||
| unknown | Titular See of Pumentum | Established | ||
| unknown | Titular See of Potentia in Piceno | Established | ||
| unknown | Titular See of Tiburnia | Established | ||
| unknown | Titular See of Aquaviva | Established | ||
| unknown | Titular See of Aguntum | Established | ||
| unknown | Titular See of Altinum | Established | ||
| unknown | Titular See of Bellicastrum | Established | ||
| unknown | Titular See of Bettonium | Established | ||
| unknown | Titular See of Bitettum | Established | ||
| unknown | Titular See of Caprulae | Established | ||
| unknown | Titular See of Capreae | Established | ||
| unknown | Titular See of Carinola | Established | ||
| unknown | Titular See of Castrum | Established | ||
| unknown | Titular See of Castro di Puglia | Established | ||
| unknown | Titular See of Castro di Sardegna | Established | ||
| unknown | Titular See of Hyccarum (Hyccara) | Established | ||
| unknown | Titular See of Mevania | Established | ||
| unknown | Titular See of Polymartium | Established | ||
| unknown | Titular See of Antium | Established | ||
| unknown | Titular See of Aquileia | Established | ||
| unknown | Titular See of Acelum | Established | ||
| unknown | Titular See of Città Ducale | Established | ||
| unknown | Titular See of Civitate | Established | ||
| unknown | Titular See of Atella | Established | ||
| unknown | Titular See of Dragonara | Established | ||
| unknown | Titular See of Fiorentino | Established | ||
| unknown | Titular See of Fundi | Established | ||
| unknown | Titular See of Forum Popilii | Established | ||
| unknown | Titular See of Gradum | Established | ||
| unknown | Titular See of Guardialfiera | Established | ||
| unknown | Titular See of Isola | Established | ||
| unknown | Titular See of Lauriacum | Established | ||
| unknown | Titular See of Lavellum | Established | ||
| unknown | Titular See of Leontium | Established | ||
| unknown | Titular See of Lesina | Established | ||
| unknown | Titular See of Litterae | Established | ||
| unknown | Titular See of Martirano | Established | ||
| unknown | Titular See of Massa Lubrense | Established | ||
| unknown | Titular See of Minervium | Established | ||
| unknown | Titular See of Minora | Established | ||
| unknown | Titular See of Minturnae | Established | ||
| unknown | Titular See of Montecorvino | Established | ||
| unknown | Titular See of Montemarano | Established | ||
| unknown | Titular See of Monteverde | Established | ||
| unknown | Titular See of Motula | Established | ||
| unknown | Titular See of Forum Novum | Established | ||
| unknown | Titular See of Hispellum | Established | ||
| unknown | Titular See of Opitergium | Established | ||
| unknown | Titular See of Oppidum Consilinum | Established | ||
| unknown | Titular See of Ploaghe | Established | ||
| unknown | Titular See of Rebellum | Established | ||
| unknown | Titular See of San Leone | Established | ||
| unknown | Titular See of Satrianum | Established | ||
| unknown | Titular See of Tauromenium | Established | ||
| unknown | Titular See of Taurianum | Established | ||
| unknown | Titular See of Termae Himerae | Established | ||
| unknown | Titular See of Urbs Salvia | Established | ||
| unknown | Titular See of Virunum | Established | ||
| unknown | Titular See of Vulturaria | Established | ||
| unknown | Titular See of Polinianum | Established | ||
| unknown | Titular See of Skálholt | Established | ||
| unknown | Titular See of Tyndaris | Established | ||
| unknown | Titular See of Torcello | Established | ||
| unknown | Titular See of Trebia | Established | ||
| unknown | Titular See of Trevico | Established | ||
| unknown | Titular See of Troyna | Established | ||
| 11 Jan | Prefecture Apostolic of Bafia, Cameroon | Elevated | Diocese of Bafia, Cameroon | Elevated |
| 11 Jan | Diocese of Eldoret, Kenya (Turkana) | Territory Lost | Prefecture Apostolic of Lodwar, Kenya | Erected |
| 11 Jan | Diocese of Eldoret, Kenya
Diocese of Kisumu, Kenya Archdiocese of Nairobi, Kenya | Territory Lost | Diocese of Nakuru, Kenya (Districts of Nakuru and Kericho) | Erected |
| 20 Jan | Diocese of Maringá, Brazil (Alto Paraná, Amapora, Diamante do Norte, Guairacá, Itauna do Sul, Loanda, Mirador, Nova Aliança do Ivaí, Nova Londrina, Paraíso do Norte, Paranavaí, Planaltina do Paraná, Porto Rico, Querencia do Norte, Santa Cruz do Monte Castelo, Santa Isabel do Ivaí,..) | Territory Lost | Diocese of Paranavaí, Parana, Brazil | Erected |
| 25 Jan | Apostolic Administration of Bačka (Bács) Jugoslavenska, Serbia | Elevated | Diocese of Subotica, Serbia | Elevated |
| 29 Jan | Diocese of Churchill, Manitoba, Canada | Name Changed | Diocese of Churchill-Baie d’Hudson, Manitoba, Canada | Name Changed |
| 9 Feb | Ordinariate of Argentina, Faithful of the Eastern Rites | Territory Lost | Archiepiscopal Exarchate of Argentina (Ukrainian) | Erected |
| 11 Feb | Vincentian Congregation (Syro-Malabar) | Decretum Laudis | ||
| 16 Feb | Diocese of Iringa, Tanzania
Territorial Abbey of Peramiho, Tanzania | Territory Lost | Diocese of Njombe, Tanzania (Njombe District) | Erected |
| 22 Feb | Missionary Society of Saint Thomas the Apostle (Syro-Malabar) | Founded | ||
| 2 Mar | Diocese of Miami, Florida, USA (Charlotte, De Soto, Hardee, and Lee)
Diocese of Saint Augustine, Florida, USA (Citrus, Hernando, Hillsborough, Manatee, Pasco, Pinellas, and Sarasota) | Territory Lost | Diocese of Saint Petersburg, Florida, USA | Erected |
| 2 Mar | Diocese of Miami, Florida, USA (Highlands, Indian River, Okeechobee, and St. Lucie)
Diocese of Saint Augustine, Florida, USA (Brevard, Lake, Marion, Orange, Osceola, Polk, Semiola, Sumter, and Volusia) | Territory Lost | Diocese of Orlando, Florida, USA | Erected |
| 2 Mar | Diocese of Mobile-Birmingham, Alabama, USA (Bay, Calhoun, Escambia, Gulf, Homes, Jackson, Okaloosa, Santa Rosa, Walton, and Washington) | Territory Lost | Diocese of Saint Augustine, Florida, USA | Territory Added |
| 2 Mar | Diocese of Miami, Florida, USA | Elevated | Archdiocese of Miami, Florida, USA | Elevated |
| 2 Mar | Diocese of Saint Augustine, Florida, USA (from Atlanta) | Metropolitan Changed | ||
| 2 Mar | Archdiocese of Botucatu, Sao Paulo, Brazil (Factura, Itaí, Paranapanema, and Taguaí)
Diocese of Sorocaba, Brazil (Barao de Antonina, Buri, Capao Bonito, Coronel Macedo, Guapiara, Itaberá, Itapeva, Itaporanga, Itararé, Ribeirão Branco, Ribeirão Vermelho do Sul, and Taquarituba) Diocese of Santos, Sao Paulo, Brazil (Apiai, Barra do Turvo, Iporanga, and Ribeira) | Territory Lost | Diocese of Itapeva, Sao Paulo, Brazil | Erected |
| 7 Mar | Archdiocese of Kerkūk (Chaldean), Iraq | Territory Lost | Archeparchy of Arbil {Erbil} (Chaldean), Iraq
Diocese of Sulaimaniya (Chaldean), Iraq | Erected |
| 11 Mar | Archdiocese of Cotonou, Benin (Mono) | Territory Lost | Diocese of Lokossa, Benin | Erected |
| 11 Mar | Diocese of Garoua, Cameroon (Diamaré and Margui Wandala (except Kaelé)) | Territory Lost | Prefecture Apostolic of Maroua-Mokolo, Cameroon | Erected |
| 11 Mar | Diocese of Garoua, Cameroon (Mayo, Danai, Logone and Chari along with Kaelé) | Territory Lost | Prefecture Apostolic of Yagoua, Cameroon | Erected |
| 22 Mar | Vicariate Apostolic of Jesselton, Malaysia | Name Changed | Vicariate Apostolic of Kota Kinabalu, Malaysia | Name Changed |
| 23 Mar | Diocese of Palo, Philippines (Southern Leyte (the Assumption, the Immaculate Conception, and the Most Holy Rosary), Matalom, Bato, Hilongos, Hindang, Inopacan, Baybay (all in Leyte), and St. Joseph and the Sacred Heart of Jesus) | Territory Lost | Diocese of Maasin, Philippines | Erected |
| 23 Mar | Diocese of Sorsogon, Philippines (Masbate (St. Anthony of Padua, St. Vincent Ferrer, and Holy Cross)) | Territory Lost | Diocese of Masbate, Philippines | Erected |
| 25 Mar | Military Ordinariate of El Salvador, Military | Erected | ||
| 25 Mar | Territorial Prelature of Encarnación y Alto Paraná, Paraguay | Split | Territorial Prelature of Alto Paraná, Paraguay (Alto Paraná)
Territorial Prelature of Encarnación, Paraguay | Split |
| 2 Apr | Diocese of Barcelona, Spain (San Lupo de Viabrea and La Batilloria) | Territory Lost | Diocese of Gerona, Spain | Territory Added |
| 9 Apr | Archdiocese of Fianarantsoa, Madagascar (Manajary and Ifanadiana)
Diocese of Tamatave, Madagascar (Nosy-Varika) | Territory Lost | Diocese of Mananjary, Madagascar | Erected |
| 9 Apr | Diocese of Ketapang, Indonesia (Sanggau to the south of river Kapuas)
Archdiocese of Pontianak, Indonesia (Sekadau) | Territory Lost | Prefecture Apostolic of Sekadau, Indonesia | Erected |
| 15 Apr | Diocese of Fort Jameson, Zambia | Name Changed | Diocese of Chipata, Zambia | Name Changed |
| 19 Apr | Delegation to Eastern Africa | Established | Nunciature to Tanzania | Established |
| 20 Apr | Diocese of Sonsón, Colombia | Name Changed | Diocese of Sonsón-Rionegro, Colombia | Name Changed |
| 20 Apr | Diocese of Haarlem, Netherlands (St. Matthias in Warmond; Lakenpolder Island of Saint John the Baptist in De Kaag) | Territory Lost | Diocese of Rotterdam, Netherlands | Territory Added |
| 26 Apr | Diocese of Abancay, Peru (Grau, Antabamba, and Cotabamba) | Territory Lost | Territorial Prelature of Chuquibambilla, Peru | Erected |
| 30 Apr | Diocese of Zacapa, Guatemala (Izabal) | Territory Lost | Apostolic Administration of Izabal, Guatemala | Erected |
| 4 May | Prefecture Apostolic of Kashmir and Jammu, India | Name Changed | Prefecture Apostolic of Jammu and Kashmir, India | Name Changed |
| 11 May | Diocese of Guaxupé, Minas Gerais, Brazil (Claraval and Ibiraci) | Territory Lost | Territorial Abbey of Claraval, Minas Gerais, Brazil | Erected |
| 12 May | Apostolic Exarchate of England and Wales {Inghilterra e Galles} (Ukrainian), Great Britain | Name Changed | Apostolic Exarchate of Great Britain (Ukrainian) (expanded to include Scotland) | Name Changed |
| 25 May | Apostles of Jesus Missionaries | Founded | ||
| 8 Jun | Archdiocese of Calcutta, India (Balasore, Mayurbhanj, and Keonjhar) | Territory Lost | Prefecture Apostolic of Balasore, India | Erected |
| 8 Jun | Diocese of Daloa, Côte d’Ivoire (Man) | Territory Lost | Diocese of Man, Côte d’Ivoire | Erected |
| 8 Jun | Archdiocese of Calcutta, India (Cuttack north of the river Mahanadi) | Territory Lost | Diocese of Cuttack, India | Territory Added |
| 8 Jun | Diocese of Nouakchott, Mauritania (from Dakar) | Metropolitan Changed | ||
| 10 Jun | Archdiocese of Durango, México (Pueblo Nuevo)
Diocese of Mazatlán, Sinaloa, México (Tamazula, Topia, Canelas, Santa Maria Otaez, and San Dimas along with San Andres de la Sierra (in Santiago Papasquiaro)) | Territory Lost | Territorial Prelature of El Salto, Durango, México | Erected |
| 11 Jun | Diocese of Regensburg, Germany (Pollenhaid, Kugelhof, Hirschthal, and Auf der Höh) | Territory Lost | Diocese of Eichstätt, Germany | Territory Added |
| 13 Jun | Little Brothers of Jesus | Approbation | ||
| 22 Jun | Territorial Prelature of São José do Grajaú, Brazil (Esperantinopolis)
Archdiocese of São Luís do Maranhão, Brazil (Parts of Bacabal and Ipixuna along with Altamira do Maranhäo, Igarapé Grande, Lago da Pedra, Lago do Junco, Lago Verde, Lima Campos, Olho d'Água dos Cunhas, Pedreiras, Pio XII, Poçâo de Pedras, Rosinopolis, Santo Antonio dos Lopes, and Vitorino Freiré) | Territory Lost | Diocese of Bacabal, Maranhão, Brazil | Erected |
| 22 Jun | Archdiocese of São Luís do Maranhão, Brazil (Dom Pedro and Governador Archer) | Territory Lost | Territorial Prelature of São José do Grajaú, Brazil | Territory Added |
| 22 Jun | Diocese of Caxias do Maranhão, Brazil (Mirador, Nova York, Paraïbano, Pastos Bons, and Sucupira do Norte) | Territory Lost | Territorial Prelature of Santo Antônio de Balsas, Maranhão, Brazil | Territory Added |
| 26 Jun | Archdiocese of Cuenca, Ecuador (Cañar) | Territory Lost | Diocese of Azogues, Ecuador | Erected |
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