| Date | Age | Event | Bishop | Title | Current Title |
| Oct | 62.0 | Appointed | Selim Jean Sfeir | Patriarchal Administrator of Cyprus (Maronite) | Archbishop |
| 1 Oct | 68.8 | Appointed | Alejandro Wilfredo Bunge | President of the Labour Office of the Apostolic See | President Emeritus |
| 52.3 | Appointed | Juan Carlos Cárdenas Toro | Bishop of Pasto, Colombia |
| 76.8 | Retired | Julio Enrique Prado Bolaños | Bishop of Pasto, Colombia | Bishop Emeritus |
| 2 Oct | 59.9 | Installed | José Mazuelos Pérez | Bishop of Islas Canarias {Canary Islands}, Spain |
| 3 Oct | 51.7 | Ordained Bishop | Jacques Assanvo Ahiwa | Titular Bishop of Elephantaria in Mauretania | Archbishop of Bouaké, Côte d’Ivoire |
| 67.0 | Ceased | Bernt Ivar (Markus) Eidsvig, C.R.S.A. | Apostolic Administrator of Trondheim, Norway | Bishop Emeritus of Oslo, Norway |
| 46.3 | Ordained Bishop | Erik Varden, O.C.S.O. | Prelate of Trondheim, Norway |
| 4 Oct | 72.7 | Died | Giovanni D’Alise † | Bishop of Caserta, Italy |
| 47.3 | Ordained Bishop | Nicolai Gennadevich Dubinin, O.F.M. Conv. | Titular Bishop of Aquae in Byzacena | Auxiliary Bishop of Madre di Dio a Mosca (Moscow), Russian Federation |
| 5 Oct | 69.9 | Appointed | Tommaso Caputo | Apostolic Administrator of Caserta, Italy | Prelate of Pompei o Beatissima Vergine Maria del Santissimo Rosario, Italy |
| 6 Oct | 56.1 | Appointed | Carlos Manuel Escribano Subías | Archbishop of Zaragoza, Spain |
| 76.1 | Retired | Fidel Herráez Vegas | Archbishop of Burgos, Spain | Archbishop Emeritus |
| 55.5 | Appointed | Mario Iceta Gavicagogeascoa | Archbishop of Burgos, Spain |
| 76.6 | Retired | Vicente Jiménez Zamora | Archbishop of Zaragoza, Spain | Archbishop Emeritus |
| 47.0 | Appointed | Javier Vilanova Pellisa | Auxiliary Bishop of Barcelona, Spain |
| 47.0 | Appointed | Javier Vilanova Pellisa | Titular Bishop of Empúries | Auxiliary Bishop of Barcelona, Spain |
| 7 Oct | 76.3 | Retired | Antônio Roberto Cavuto, O.F.M. Cap. | Bishop of Itapipoca, Ceara, Brazil | Bishop Emeritus |
| 58.7 | Appointed | Rosalvo Cordeiro de Lima | Bishop of Itapipoca, Ceara, Brazil |
| 59.1 | Resigned | Kamal Fahim Awad (Boutros) Hanna | Bishop of Minya {Ermopoli Maggiore; Minieh} (Coptic), Egypt | Bishop Emeritus |
| 65.1 | Appointed | Ibrahim Isaac Sedrak (Sidrak) | Patriarchal Administrator of Minya {Ermopoli Maggiore; Minieh} (Coptic), Egypt | Patriarch of Alexandria {Alessandria} (Coptic), Egypt |
| 9 Oct | 66.9 | Ordained Bishop | David Ernest Charles Evans | Titular Bishop of Cuncacestre | Auxiliary Bishop of Birmingham, England, Great Britain |
| 50.0 | Ordained Bishop | Stephen James Lawrence Wright | Titular Bishop of Ramsbiria | Bishop of Hexham and Newcastle, England, Great Britain |
| 10 Oct | 67.2 | Installed | Valentim Fagundes de Meneses, M.S.C. | Bishop of Balsas, Maranhão, Brazil |
| 54.8 | Appointed | Roberto José Ferrari | Auxiliary Bishop of Tucumán, Argentina |
| 54.8 | Appointed | Roberto José Ferrari | Titular Bishop of Pinhel | Auxiliary Bishop of Tucumán, Argentina |
| 50.9 | Ordained Bishop | Jean-Crispin Kimbeni Ki Kanda | Titular Bishop of Dragonara | Bishop of Kisantu, Congo (Dem. Rep.) |
| 47.7 | Ordained Bishop | Charles Ndaka Salabisala | Titular Bishop of Liberalia | Auxiliary Bishop of Kinshasa, Congo (Dem. Rep.) |
| 65.8 | Appointed | Justo Rodríguez Gallego | Auxiliary Bishop of Zárate-Campana, Argentina |
| 65.8 | Appointed | Justo Rodríguez Gallego | Titular Bishop of Nomentum | Auxiliary Bishop of Zárate-Campana, Argentina |
| 57.7 | Ordained Bishop | Vincent Tshomba Shamba Kotsho | Titular Bishop of Oescus | Bishop of Tshumbe, Congo (Dem. Rep.) |
| 11 Oct | 62.4 | Installed | Adriano Cevolotto | Bishop of Piacenza-Bobbio, Italy |
| 12 Oct | 57.0 | Appointed | Omar Alberto Sánchez Cubillos, O.P. | Archbishop of Popayán, Colombia |
| 13 Oct | 84.5 | Died | Claude Feidt † | Archbishop Emeritus of Aix (-Arles), France |
| 14 Oct | 56.0 | Appointed | William Draper Byrne | Bishop of Springfield in Massachusetts, USA |
| 85.5 | Died | José Augusto Martins Fernandes Pedreira † | Bishop Emeritus of Viana do Castelo, Portugal |
| 15 Oct | 80.0 | Died | Antonio Ángel Algora Hernando † | Bishop Emeritus of Ciudad Real, Spain |
| 60.7 | Appointed | Fridolin Ambongo Besungu, O.F.M. Cap. | Member of the Council of Cardinals | Cardinal, Archbishop of Kinshasa, Congo (Dem. Rep.) |
| 54.1 | Appointed | Marco Mellino | Secretary of the Council of Cardinals |
| 72.8 | Appointed | Marcello Semeraro | Prefect of the Congregation for the Causes of Saints | Cardinal, Prefect of the Dicastery for the Causes of Saints |
| 72.8 | Appointed | Marcello Semeraro | Apostolic Administrator of Albano, Italy | Cardinal, Prefect of the Dicastery for the Causes of Saints |
| 72.8 | Appointed | Marcello Semeraro | Archbishop (Personal Title) | Cardinal, Prefect of the Dicastery for the Causes of Saints |
| 16 Oct | 99.0 | Died | Odore Joseph Gendron † | Bishop Emeritus of Manchester, New Hampshire, USA |
| 52.9 | Appointed | Hélio Pereira dos Santos | Coadjutor Bishop of Serrinha, Bahia, Brazil | Bishop |
| 17 Oct | 54.0 | Appointed | Juan Carlos Arcq Guzmán | Auxiliary Bishop of Monterrey, Nuevo León, México | Bishop of Tacámbaro, Michoacán, México |
| 54.0 | Appointed | Juan Carlos Arcq Guzmán | Titular Bishop of Milevum | Bishop of Tacámbaro, Michoacán, México |
| 52.4 | Ordained Bishop | Antônio Fontinele de Melo | Bishop of Humaitá, Amazonas, Brazil |
| 68.7 | Appointed | José Manuel Garza Madero | Auxiliary Bishop of Monterrey, Nuevo León, México |
| 68.7 | Appointed | José Manuel Garza Madero | Titular Bishop of Tetci | Auxiliary Bishop of Monterrey, Nuevo León, México |
| 48.9 | Appointed | César Garza Miranda, O.F.M. | Auxiliary Bishop of Monterrey, Nuevo León, México |
| 48.9 | Appointed | César Garza Miranda, O.F.M. | Titular Bishop of Magnetum | Auxiliary Bishop of Monterrey, Nuevo León, México |
| 57.3 | Ordained Bishop | Giovanni Gaspari | Titular Archbishop of Alba Maritima | Apostolic Nuncio to Korea |
| 68.1 | Resigned | Edward Janiak † | Bishop of Kalisz, Poland | Bishop Emeritus |
| 41.8 | Ordained Bishop | Milan Stipić | Bishop of Križevci (Kreutz) (Križevci), Croatia |
| 18 Oct | 85.3 | Died | Agostino Giuseppe Delfino, O.F.M. Cap. † | Bishop Emeritus of Berbérati, Central African Republic |
| 52.4 | Ordained Bishop | Dario Gervasi | Titular Bishop of Subaugusta | Adjunct Secretary of the Dicastery for the Laity, the Family and Life |
| 20 Oct | 64.9 | Appointed | Kurt Richard Burnette | Apostolic Administrator of Saints Cyril and Methodius of Toronto (Slovak), Canada | Bishop of Passaic (Ruthenian), New Jersey, USA |
| 70.4 | Installed | Fidencio López Plaza | Bishop of Querétaro, México |
| 47.4 | Resigned | Marián Andrej Pacák, C.Ss.R. | Bishop of Saints Cyril and Methodius of Toronto (Slovak), Canada | Bishop Emeritus |
| 83.2 | Died | Bogdan Józef Wojtuś † | Auxiliary Bishop Emeritus of Gniezno, Poland |
| 21 Oct | 53.2 | Appointed | Paulo Cezar Costa | Cardinal, Archbishop of Brasília, Distrito Federal, Brazil |
| 57.3 | Appointed | Luis Ángel de las Heras Berzal, C.M.F. | Bishop of León, Spain |
| 75.5 | Retired | Julián López Martín | Bishop of León, Spain | Bishop Emeritus |
| 51.3 | Appointed | Moacir Silva Arantes | Bishop of Barreiras, Bahia, Brazil |
| 22 Oct | 51.9 | Appointed | Elkin Fernando Álvarez Botero † | Bishop of Santa Rosa de Osos, Colombia |
| 58.8 | Confirmed | Thomas Chen Tianhao | Bishop of Qingdao [Tsingtao], China |
| 50.1 | Appointed | Thomas Edward Dowd | Bishop of Sault Sainte Marie, Ontario, Canada |
| 75.7 | Retired | Maurice Marcel Gardès | Archbishop of Auch (-Condom-Lectoure-Lombez), France | Archbishop Emeritus |
| 60.0 | Appointed | Olivier Jacques Marie de Germay de Cirfontaine | Archbishop of Lyon, France |
| 53.9 | Appointed | Bertrand Didier Marie Joseph Lacombe | Archbishop of Auch (-Condom-Lectoure-Lombez), France |
| 24 Oct | 70.9 | Ceased | Michael Dixon Bhasera | Apostolic Administrator of Gweru, Zimbabwe | Bishop Emeritus of Masvingo, Zimbabwe |
| 66.8 | Ceased | Angelo De Donatis | Apostolic Administrator of Italy, Faithful of the Ukrainian Catholic Church (Ukrainian) | Cardinal, Major Penitentiary of the Apostolic Penitentiary |
| 74.3 | Appointed | Paulo Dionisio Lachovicz (Liakhovych), O.S.B.M. | Apostolic Exarch of Italy, Faithful of the Ukrainian Catholic Church (Ukrainian) | Apostolic Exarch Emeritus |
| 58.6 | Ordained Bishop | Francesco Lomanto | Archbishop of Siracusa, Italy |
| 52.0 | Installed | Rudolf Nyandoro | Bishop of Gweru, Zimbabwe |
| 55.5 | Appointed | Pierbattista Pizzaballa, O.F.M. | Cardinal, Patriarch of Jerusalem {Gerusalemme}, Palestine |
| 82.5 | Died | Paul Zingtung Grawng † | Archbishop Emeritus of Mandalay, Myanmar |
| 25 Oct | 56.9 | Installed | Olivier Claude Philippe Marie Leborgne | Bishop of Arras (-Boulogne-Saint-Omer), France |
| 26 Oct | 75.0 | Retired | Emmanuel Marie Philippe Louis Lafont | Bishop of Cayenne (Cajenna), French Guyana, Antilles | Bishop Emeritus |
| 27 Oct | 57.3 | Appointed | Gerardo Miguel Nieves Loja | Coadjutor Bishop of Riobamba, Ecuador | Auxiliary Bishop of Guayaquil, Ecuador |
| 62.6 | Died | Jan Niemiec † | Auxiliary Bishop of Kamyanets-Podilskyi, Ukraine |
| 28 Oct | 48.4 | Appointed | Nicolás Renán Aguilera Arroyo | Bishop of Potosí, Bolivia |
| 88.5 | Died | Anthony Soter Fernandez † | Cardinal, Archbishop Emeritus of Kuala Lumpur, Malaysia |
| 54.0 | Installed | Karol Kulczycki, S.D.S. | Bishop of Port Pirie, Australia |
| 67.3 | Died | Štefan Sečka † | Bishop of Spiš, Slovakia |
| 29 Oct | 77.5 | Retired | Francesco Cacucci | Archbishop of Bari-Bitonto, Italy | Archbishop Emeritus |
| 73.0 | Resigned | Giovanni D’Ercole, F.D.P. | Bishop of Ascoli Piceno, Italy | Bishop Emeritus |
| 54.6 | Appointed | Ján Kuboš | Administrator of Spiš, Slovakia | Auxiliary Bishop |
| 57.4 | Appointed | Domenico Pompili | Apostolic Administrator of Ascoli Piceno, Italy | Bishop of Verona, Italy |
| 60.1 | Appointed | Giuseppe Satriano | Archbishop of Bari-Bitonto, Italy |
| 81.9 | Died | Józef Zawitkowski † | Auxiliary Bishop Emeritus of Łowicz, Poland |
| 30 Oct | 45.8 | Ceased | Elia Eskandr Abd Elmalak, O.F.M. | Apostolic Administrator of Alexandria of Egypt {Alessandria di Egitto} (-Eliopoli di Egitto-Port-Said) | Priest of Order of Friars Minor |
| 75.2 | Retired | Octavio Cisneros | Auxiliary Bishop of Brooklyn, New York, USA | Auxiliary Bishop Emeritus |
| 80.1 | Appointed | Enrico Feroci | Titular Archbishop of Cures Sabinorum | Cardinal, Cardinal-Deacon of Santa Maria del Divino Amore a Castel di Leva |
| 55.0 | Appointed | Mauro Maria Gambetti, O.F.M. Conv. | Titular Archbishop of Thisiduo | Cardinal, President of the Fabric of St. Peter |
| 58.6 | Ordained Bishop | Claudio Lurati, M.C.C.I. | Vicar Apostolic of Alexandria of Egypt {Alessandria di Egitto} (-Eliopoli di Egitto-Port-Said) |
| 45.8 | Ordained Bishop | Atanasius Firas Mundher Dardar | Titular Archbishop of Tagritum | Patriarchal Exarch of Bassorah e Golfo (Syrian), Iraq |
| 91.7 | Died | Ambrogio Ravasi, I.M.C. † | Bishop Emeritus of Marsabit, Kenya |
| 60.6 | Appointed | Fernando Valera Sánchez | Bishop of Zamora, Spain |
| 31 Oct | 65.8 | Installed | Roberto Bergamaschi, S.D.B. | Vicar Apostolic of Gambella, Ethiopia |
| 75.5 | Retired | José Alejandro Castaño Arbeláez, O.A.R. | Bishop of Cartago, Colombia | Bishop Emeritus |
| 94.9 | Died | Arturo Lona Reyes † | Bishop Emeritus of Tehuantepec, Oaxaca, México |
| 73.6 | Appointed | José Roberto Ospina Leongómez | Apostolic Administrator of Cartago, Colombia | Bishop Emeritus of Buga, Colombia |