| Date | Age | Event | Bishop | Title | Current Title |
| 1 Sep | 54.1 | Succeeded | Pierre Denaut † | Bishop of Québec, Canada |
| 58.5 | Resigned | Jean-François Hubert † | Bishop of Québec, Canada | Bishop Emeritus |
| 3 Sep | 27.7 | Ordained Deacon | Maximilian Joseph Gottfried Sommerau Beeckh † | Deacon of Wien {Vienna}, Austria | Cardinal, Archbishop of Olomouc, Czechia |
| 34.4 | Ordained Bishop | Emanuel Maria Thun † | Titular Bishop of Iasus | Bishop of Trento, Italy |
| 4 Sep | 54.1 | Installed | Pierre Denaut † | Bishop of Québec, Canada |
| 5 Sep | 85.9 | Died | [Pierre Pacareau] † | Bishop of [Gironde (Constitutional), France] |
| 75.6 | Died | Krysztof Hilary Szembek † | Bishop of Płock, Poland |
| 54.3 | Succeeded | Onufry Kajetan Szembek † | Bishop of Płock, Poland |
| 6 Sep | | Born | Ramón Garcia y Antón, O.S.H. † | | Bishop of Tuy, Spain |
| 22.2 | Ordained Deacon | József Kopácsy † | Deacon | Archbishop of Esztergom, Hungary |
| 8 Sep | 65.1 | Ordained Bishop | Klemens August Maria von Merle † | Titular Bishop of Bethsaida | Auxiliary Bishop of Köln {Cologne}, Germany |
| 65.8 | Died | [Isaac-Étienne Robinet] † | Bishop Emeritus of [Charente-Inférieure (Constitutional), France] |
| 10 Sep | 65.7 | Ordained Bishop | József Petheö † | Titular Bishop of Methone | Auxiliary Bishop of Pécs, Hungary |
| 27.7 | Ordained Priest | Maximilian Joseph Gottfried Sommerau Beeckh † | Priest of Wien {Vienna}, Austria | Cardinal, Archbishop of Olomouc, Czechia |
| 17 Sep | 52.7 | Selected | Kajetan Ignacy Kicki † | Archbishop of Lviv, Ukraine |
| 19 Sep | 50.1 | Appointed | Alexander Cameron † | Coadjutor Vicar Apostolic of Lowland District, Scotland, Great Britain | Vicar Apostolic Emeritus |
| 50.1 | Appointed | Alexander Cameron † | Titular Bishop of Maximianopolis in Palaestina | Vicar Apostolic Emeritus of Lowland District, Scotland, Great Britain |
| 21 Sep | | Born | Johannes Boßmann (Bossmann) † | | Auxiliary Bishop of Münster, Germany |
| 22 Sep | 22.9 | Ordained Priest | Carmelo Cordiviola † | Priest | Bishop of Albenga, Italy |
| 73.2 | Died | Juan Antonio de los Tueros † | Archbishop of Burgos, Spain |
| 23 Sep | 43.0 | Ordained Deacon | Bernardo Bernardino Beltrão Freire † | Deacon | Bishop of Pinhel, Portugal |
| 24.9 | Ordained Priest | Paul-Thérèse-David d’Astros † | Priest | Cardinal, Archbishop of Toulouse (-Narbonne), France |
| 22.8 | Ordained Priest | Marcin von Dunin Sulgostowski † | Priest of Kraków, Poland | Archbishop of Gniezno e Poznań, Poland |
| 45.5 | Ordained Priest | Filippo Ghighi † | Priest of Arezzo, Italy | Bishop of Sovana (Soana), Italy |
| 24.1 | Ordained Priest | Pietro Lepore † | Priest | Bishop of Castellaneta, Italy |
| 22.0 | Ordained Deacon | Giovanni Pietro Aurelio Mutti, O.S.B. † | Deacon of Order of Saint Benedict | Patriarch of Venezia {Venice}, Italy |
| 22.0 | Ordained Deacon | Johann Leonard Pfaff † | Deacon of Fulda, Germany | Bishop |
| 22.8 | Ordained Priest | Michele Virgili † | Priest | Bishop of Comacchio, Italy |
| 22.7 | Ordained Priest | Pierre-Tobie Yenni † | Priest of Lausanne, Switzerland | Bishop of Lausanne et Genève, Switzerland |
| 24 Sep | 43.0 | Ordained Priest | Bernardo Bernardino Beltrão Freire † | Priest | Bishop of Pinhel, Portugal |
| 1 Oct | 61.5 | Ordained Bishop | [Matthieu Asselin] † | Bishop of [Pas-de-Calais (Constitutional), France] | Bishop Emeritus |
| 77.3 | Died | Domenico Maria Clavarini, O.P. † | Bishop of Ventimiglia, Italy |
| 23.5 | Ordained Deacon | Georg Prünster † | Deacon of Brixen {Bressanone}, Italy | Auxiliary Bishop |
| 24.3 | Ordained Priest | Hermann Anton Constantin Franz Sales Johann Nepomuk von Vicari † | Priest of Konstanz {Constance}, Germany | Archbishop of Freiburg im Breisgau, Germany |
| 6 Oct | | Born | Joseph Othmar von Rauscher † | | Cardinal, Archbishop of Wien {Vienna}, Austria |
| 8 Oct | 63.6 | Ordained Bishop | Francisco Antonio Cebrián y Valdá † | Bishop of Orihuela, Spain | Cardinal, Patriarch of West Indies, Spain |
| 23.5 | Ordained Priest | Georg Prünster † | Priest of Brixen {Bressanone}, Italy | Auxiliary Bishop |
| 11 Oct | 58.5 | Died | Gregorio José de Omaña y Sotomayor † | Bishop of Antequera, Oaxaca, México |
| 14 Oct | 65.7 | Appointed | Raimundo Melchor Magi Gómez, O. de M. † | Bishop of Guadix, Spain |
| 15 Oct | 71.7 | Ordained Bishop | José Antonio Sáenz Santamaría † | Bishop of Segovia, Spain |
| 17 Oct | 58.6 | Died | Jean-François Hubert † | Bishop Emeritus of Québec, Canada |
| 58.1 | Died | Santiago Pérez Arenillas † | Bishop of Gerona, Spain |
| 19 Oct | | Born | André-Joseph Guitton † | | Bishop of Poitiers, France |
| Born | James Sharples † | | Coadjutor Vicar Apostolic of Lancashire District, England, Great Britain |
| 22 Oct | 45.2 | Ordained Bishop | Juan García Benito † | Bishop of Tuy, Spain | Archbishop Emeritus of Santiago de Compostela, Spain |
| 43.9 | Ordained Bishop | Francisco Antonio La Dueña Cisneros † | Bishop of Urgell, Spain | Bishop of Segorbe, Spain |
| 53.1 | Ordained Bishop | Manuel Cayetano Muñoz Benavente † | Titular Bishop of Lycopolis | Auxiliary Bishop Emeritus of Sevilla {Seville}, Spain |
| 24 Oct | 62.4 | Selected | Vincenzo Maria Castro † | Bishop of Castellaneta, Italy |
| 49.0 | Selected | Giuseppe Maria Cenicela, O.F.M. Disc. † | Archbishop of Reggio Calabria, Italy |
| 64.5 | Selected | Fabrizio Cimino, C.Ss.R. † | Bishop of Oria, Italy |
| 53.0 | Selected | Rocco Coiro † | Bishop of Crotone (Cotrone), Italy |
| 51.7 | Selected | Giovanni Gaetano del Muscio, Sch. P. † | Bishop of San Severo, Italy | Archbishop of Manfredonia, Italy |
| 50.9 | Selected | Bernardo Maria della Torre † | Bishop of Lettere (-Gragnano), Italy | Bishop of Castellammare di Stabia, Italy |
| 58.3 | Selected | Annibale Di Leo † | Archbishop of Brindisi, Italy |
| 68.9 | Selected | Gennaro Clemente Francone † | Archbishop (Personal Title) of Troia, Italy | Bishop |
| 50.5 | Selected | Ludovico Ludovici (Ludovico), O.F.M. Obs. † | Bishop of Policastro, Italy |
| 52.1 | Selected | Orazio Magliola † | Bishop of Acerra, Italy |
| 58.9 | Selected | Gerardo Mele † | Bishop of Tropea, Italy |
| 51.7 | Selected | Riccardo Capece Minutolo, O.S.B. † | Bishop of Gaeta, Italy |
| 47.0 | Selected | Camillo Cattaneo della Volta † | Archbishop of Acerenza e Matera, Italy | Archbishop of Acerenza e Matera, Italy |
| 63.8 | Selected | Giovanni Vincenzo Monforte † | Bishop of Nola, Italy | Archbishop of Napoli {Naples}, Italy |
| Born | Štefan Moyses † | | Bishop of Banská Bystrica, Slovakia |
| 40.0 | Selected | Michele Palmieri † | Bishop of Mottola (Motula), Italy | Bishop of Monopoli, Italy |
| 49.5 | Selected | Carlo Maria Rosini † | Bishop of Pozzuoli, Italy |
| 51.3 | Selected | Salvatore Spinelli, O.S.B. † | Archbishop of Salerno, Italy |
| 48.7 | Selected | Nicola Vecchi † | Bishop of Teano, Italy |
| 25 Oct | | Born | Crispino Agostinucci † | | Bishop of Montefeltro, Italy |
| 26 Oct | 62.1 | Resigned | John Geddes † | Coadjutor Vicar Apostolic of Lowland District, Scotland, Great Britain | Coadjutor Vicar Apostolic Emeritus |
| Born | José Vicente Ramírez de Arellano † | | Bishop of Córdoba (Tucumán), Argentina |
| 28 Oct | 23.5 | Ordained Deacon | José Manuel Fernández de Córdoba y Meló † | Deacon | Bishop of La Paz, Bolivia |
| 50.7 | Ordained Bishop | Pablo Sitjar Ruata † | Titular Bishop of Geras | Bishop of Barcelona, Spain |
| 31 Oct | 64.4 | Selected | Philip Bandini † | Bishop of Larino, Italy |
| 57.8 | Selected | Vincenzo Barisani, O.E.S.A. † | Bishop of Gerace, Italy |
| 55.1 | Selected | Giuseppe Bolognese † | Bishop of Marsi, Italy |
| 56.8 | Selected | Gennaro Carelli † | Bishop of Conversano, Italy |
| 46.2 | Selected | Agostino Colaianni † | Bishop of Sora, Italy |
| 66.9 | Selected | Reginaldo Coppola, O.P. † | Bishop of San Marco (Argentano), Italy |
| 59.2 | Selected | Pietro de Felice † | Bishop of Sessa Aurunca, Italy |
| 48.8 | Selected | Salvatore de Lucia † | Bishop of Carinola (Calina), Italy |
| 52.8 | Selected | Giovanni Filippo Ferroni † | Bishop of Muro Lucano, Italy | Bishop Emeritus |
| 57.0 | Selected | Alfonso Maria Freda † | Bishop of Lucera, Italy |
| 41.0 | Selected | Paolo Garzilli † | Bishop of Marsico Nuovo, Italy | Bishop of Sessa Aurunca, Italy |
| 59.8 | Selected | Isidoro Leggio, C.Ss.R. † | Bishop of Umbriatico (Umbriaticum), Italy |
| 32.1 | Selected | Michelangelo Lupoli † | Bishop of Montepeloso, Italy | Archbishop of Salerno (-Acerno), Italy |
| 42.9 | Selected | Giuseppe Mancusi † | Bishop of Acerno, Italy |
| 62.6 | Selected | Nicola Martini † | Bishop of Vulturara e Montecorvino, Italy |
| 57.7 | Selected | Giuseppe Maria de Mellis † | Bishop of Aquino e Pontecorvo, Italy |
| 46.1 | Selected | Michele Natale † | Bishop of Vico Equense, Italy |
| 61.4 | Selected | Vincenzo Maria Parruco Tries, O.P. † | Bishop of Bovino, Italy |
| 61.3 | Selected | Carlo Pellegrini † | Bishop of Nicastro, Italy | Bishop Emeritus |
| 59.4 | Selected | Francesco Ubaldo Maria Romanzi † | Bishop of Lacedonia, Italy |
| 51.3 | Selected | Filippo Speranza † | Bishop of Guardialfiera (Guardia), Italy | Bishop of Capaccio, Italy |
| 39.4 | Selected | Vincenzo Torrusio † | Bishop of Capaccio, Italy | Bishop of Nola, Italy |
| 59.6 | Selected | Serafino (Michelangelo) Vitale, O.S.B. † | Bishop of Minori, Italy |
| 1 Nov | 17.7 | Professed | Franz Laurenz (Johannes Franz Ignatius) Mauermann, O. Cist. † | Member of Order of Cistercians | Vicar Apostolic of Saxonia (Saxony), Germany |
| 3 Nov | 24.1 | Ordained Priest | Gustave-Maximilien-Juste de Croÿ-Solre † | Priest | Cardinal, Archbishop of Rouen, France |
| 5 Nov | 65.0 | Ordained Bishop | Simón Casaviella López † | Bishop of Tudela, Spain |
| 31.0 | Ordained Bishop | Leopold Maximilian von Firmian (Frimian) † | Titular Bishop of Tiberias | Archbishop of Wien {Vienna}, Austria |
| 7 Nov | | Born | Florencio Llorente y Montón † | | Bishop of Gerona, Spain |
| 10 Nov | 40.0 | Selected | [Guillaume Mauviel] † | Bishop of [Saint-Domingue-Sud (Constitutional), Haïti] | Bishop Emeritus |
| 24 Nov | 72.8 | Died | Philip MacDevitt † | Bishop of Derry, Ireland |
| 50.8 | Succeeded | Charles O’Donnell † | Bishop of Derry, Ireland |
| 25 Nov | 55.6 | Succeeded | William Gregory Sharrock, O.S.B. † | Vicar Apostolic of Western District, England, Great Britain |
| 75.8 | Died | Charles Walmesley, O.S.B. † | Vicar Apostolic of Western District, England, Great Britain |
| 27 Nov | | Born | José Xavier de Cerveira e Sousa † | | Bishop of Viseu, Portugal |
| 61.8 | Died | Mattia Santoro † | Bishop of Polignano (Polinianum), Italy |
| 28 Nov | | Born | Andreas Gollmayr † | | Archbishop of Gorizia e Gradisca, Italy |
| 3 Dec | | Born | Francis Patrick Kenrick † | | Archbishop of Baltimore, Maryland, USA |
| 4 Dec | 21.2 | Professed | Carlos de São José e Souza, O.C.D. † | Member of Order of Discalced Carmelites | Bishop of São Luís do Maranhão, Brazil |
| 11 Dec | | Born | Francesco Pentini † | | Cardinal, Priest of the Roman Curia - Other |
| 14 Dec | | Born | Antonio Maria Cagiano de Azevedo † | | Cardinal, Major Penitentiary of the Apostolic Penitentiary |
| 18 Dec | 63.8 | Appointed | Andrés Aguiar Caamaño † | Bishop of Mondoñedo, Spain |
| 76.9 | Appointed | Gabriel Álvarez de Faria y Sánchez Zarzosa † | Bishop of Badajoz, Spain |
| 42.1 | Appointed | Ramón José Arce † | Archbishop of Burgos, Spain | Patriarch Emeritus of West Indies, Spain |
| 58.0 | Confirmed | Vincenzo Barisani, O.E.S.A. † | Bishop of Gerace, Italy |
| 52.8 | Appointed | Francesco Saverio Bassi, O.S.B. † | Archbishop of Chieti, Italy |
| 47.3 | Confirmed | Pedro Inocencio Bejarano † | Bishop of Buenos Aires, Argentina | Bishop of Sigüenza, Spain |
| 43.3 | Confirmed | Bernardo Bernardino Beltrão Freire † | Bishop of Pinhel, Portugal |
| 55.2 | Confirmed | Giuseppe Bolognese † | Bishop of Marsi, Italy |
| 56.9 | Confirmed | Gennaro Carelli † | Bishop of Conversano, Italy |
| 32.5 | Appointed | José Casquete Prado, O.S. † | Titular Bishop of Cisamus |
| 62.5 | Confirmed | Vincenzo Maria Castro † | Bishop of Castellaneta, Italy |
| 49.2 | Confirmed | Giuseppe Maria Cenicela, O.F.M. Disc. † | Archbishop of Reggio Calabria, Italy |
| 53.2 | Confirmed | Rocco Coiro † | Bishop of Crotone (Cotrone), Italy |
| 46.3 | Confirmed | Agostino Colaianni † | Bishop of Sora, Italy |
| 65.9 | Appointed | Joaquín Company Soler, O.F.M. Obs. † | Archbishop of Zaragoza, Spain | Archbishop of Valencia, Spain |
| 67.0 | Confirmed | Reginaldo Coppola, O.P. † | Bishop of San Marco (Argentano), Italy |
| 51.8 | Confirmed | Giovanni Gaetano del Muscio, Sch. P. † | Bishop of San Severo, Italy | Archbishop of Manfredonia, Italy |
| 51.1 | Confirmed | Bernardo Maria della Torre † | Bishop of Lettere (-Gragnano), Italy | Bishop of Castellammare di Stabia, Italy |
| 59.4 | Confirmed | Pietro de Felice † | Bishop of Sessa Aurunca, Italy |
| 48.9 | Confirmed | Salvatore de Lucia † | Bishop of Carinola (Calina), Italy |
| 58.7 | Appointed | Felipe Antonio Fernández Vallejo † | Archbishop of Santiago de Compostela, Spain |
| 53.0 | Confirmed | Giovanni Filippo Ferroni † | Bishop of Muro Lucano, Italy | Bishop Emeritus |
| 69.0 | Confirmed | Gennaro Clemente Francone † | Archbishop (Personal Title) of Troia, Italy | Bishop |
| 41.1 | Confirmed | Paolo Garzilli † | Bishop of Marsico Nuovo, Italy | Bishop of Sessa Aurunca, Italy |
| 58.6 | Appointed | Pietro Fedele Grisolia † | Archbishop of Santa Severina, Italy |
| 52.9 | Confirmed | Kajetan Ignacy Kicki † | Archbishop of Lviv, Ukraine |
| 60.0 | Confirmed | Isidoro Leggio, C.Ss.R. † | Bishop of Umbriatico (Umbriaticum), Italy |
| 50.6 | Confirmed | Ludovico Ludovici (Ludovico), O.F.M. Obs. † | Bishop of Policastro, Italy |
| 32.2 | Confirmed | Michelangelo Lupoli † | Bishop of Montepeloso, Italy | Archbishop of Salerno (-Acerno), Italy |
| 52.2 | Confirmed | Orazio Magliola † | Bishop of Acerra, Italy |
| 43.0 | Confirmed | Giuseppe Mancusi † | Bishop of Acerno, Italy |
| 51.5 | Confirmed | José António Pinto de Mendonça Arrais † | Bishop of Guarda, Portugal |
| 51.8 | Confirmed | Riccardo Capece Minutolo, O.S.B. † | Bishop of Gaeta, Italy |
| 47.2 | Confirmed | Camillo Cattaneo della Volta † | Archbishop of Acerenza e Matera, Italy | Archbishop of Acerenza e Matera, Italy |
| 46.3 | Confirmed | Michele Natale † | Bishop of Vico Equense, Italy |
| 49.6 | Confirmed | Carlo Maria Rosini † | Bishop of Pozzuoli, Italy |
| 52.4 | Appointed | Joaquín Sánchez Cutanda † | Bishop of Huesca, Spain |
| 45.4 | Appointed | Christoph Emanuel (Krzysztof Emanuel) von Schimonski-Schimoni † | Auxiliary Bishop of Wrocław (Breslau), Poland | Bishop |
| 45.4 | Appointed | Christoph Emanuel (Krzysztof Emanuel) von Schimonski-Schimoni † | Titular Bishop of Lerus | Bishop of Wrocław (Breslau), Poland |
| 51.5 | Confirmed | Salvatore Spinelli, O.S.B. † | Archbishop of Salerno, Italy |
| 69.9 | Appointed | Lorenzo Suarez de Cantillana † | Bishop of Paraguay (o Ssma Assunzione) |
| 76.1 | Died | Jan Szyjkowski † | Auxiliary Bishop of Lutsk (Łuck), Ukraine |
| 39.6 | Confirmed | Vincenzo Torrusio † | Bishop of Capaccio, Italy | Bishop of Nola, Italy |
| 48.8 | Confirmed | Nicola Vecchi † | Bishop of Teano, Italy |
| 50.2 | Appointed | Antonio Vila y Campos † | Bishop of Menorca, Spain | Bishop of Albarracin, Spain |
| 58.7 | Confirmed | Philipp Franz Wilderich Nepomuk von Walderdorf † | Bishop of Speyer, Germany |
| 21 Dec | 58.0 | Ordained Bishop | Vincenzo Barisani, O.E.S.A. † | Bishop of Gerace, Italy |
| 52.8 | Ordained Bishop | Francesco Saverio Bassi, O.S.B. † | Archbishop of Chieti, Italy |
| 55.2 | Ordained Bishop | Giuseppe Bolognese † | Bishop of Marsi, Italy |
| 49.2 | Ordained Bishop | Giuseppe Maria Cenicela, O.F.M. Disc. † | Archbishop of Reggio Calabria, Italy |
| 53.2 | Ordained Bishop | Rocco Coiro † | Bishop of Crotone (Cotrone), Italy |
| 46.3 | Ordained Bishop | Agostino Colaianni † | Bishop of Sora, Italy |
| 67.1 | Ordained Bishop | Reginaldo Coppola, O.P. † | Bishop of San Marco (Argentano), Italy |
| 59.4 | Ordained Bishop | Pietro de Felice † | Bishop of Sessa Aurunca, Italy |
| 48.9 | Ordained Bishop | Salvatore de Lucia † | Bishop of Carinola (Calina), Italy |
| 53.0 | Ordained Bishop | Giovanni Filippo Ferroni † | Bishop of Muro Lucano, Italy | Bishop Emeritus |
| 41.1 | Ordained Bishop | Paolo Garzilli † | Bishop of Marsico Nuovo, Italy | Bishop of Sessa Aurunca, Italy |
| 58.6 | Ordained Bishop | Pietro Fedele Grisolia † | Archbishop of Santa Severina, Italy |
| 60.0 | Ordained Bishop | Isidoro Leggio, C.Ss.R. † | Bishop of Umbriatico (Umbriaticum), Italy |
| 32.2 | Ordained Bishop | Michelangelo Lupoli † | Bishop of Montepeloso, Italy | Archbishop of Salerno (-Acerno), Italy |
| 52.3 | Ordained Bishop | Orazio Magliola † | Bishop of Acerra, Italy |
| 51.8 | Ordained Bishop | Riccardo Capece Minutolo, O.S.B. † | Bishop of Gaeta, Italy |
| 47.2 | Ordained Bishop | Camillo Cattaneo della Volta † | Archbishop of Acerenza e Matera, Italy | Archbishop of Acerenza e Matera, Italy |
| 46.3 | Ordained Bishop | Michele Natale † | Bishop of Vico Equense, Italy |
| 49.7 | Ordained Bishop | Carlo Maria Rosini † | Bishop of Pozzuoli, Italy |
| 39.6 | Ordained Bishop | Vincenzo Torrusio † | Bishop of Capaccio, Italy | Bishop of Nola, Italy |
| 23 Dec | 28.3 | Ordained Deacon | Karl Kajetan von Gaisruck (Gaysruck) † | Deacon of Passau, Germany | Cardinal, Archbishop of Milano {Milan}, Italy |
| 24 Dec | 48.4 | Selected | Dominique Lacombe † | Bishop of [Gironde (Constitutional), France] | Bishop of Angoulême, France |
| 25 Dec | | Born | Bernard Donald McDonald † | | Bishop of Charlottetown, Prince Edward Island, Canada |
| 27 Dec | 24.5 | Ordained Priest | Simón Rojas Guardiola y Hortoneda, O.S.B. † | Priest of Order of Saint Benedict | Bishop of Urgell, Spain |
| 28 Dec | 55.2 | Installed | Giuseppe Bolognese † | Bishop of Marsi, Italy |
| 31 Dec | 56.9 | Ordained Bishop | Gennaro Carelli † | Bishop of Conversano, Italy |
| 52.2 | Ordained Bishop | Luis Rodrigues Vilares † | Bishop of Funchal, Portugal |
| 54.1 | Ordained Bishop | Cypriano de São José, O.F.M. Ref. † | Bishop of Mariana, Brazil |
| 25.0 | Ordained Priest | Aloisio San Vitale † | Priest | Bishop of Piacenza, Italy |