| Date | Age | Event | Bishop | Title | Current Title |
| Sep | 83.6 | Died | Giuseppe Maria Bottari, O.F.M. Conv. † | Bishop of Pula (Pola), Croatia |
| 64.9 | Died | Michelangelo Gentili † | Bishop of Belcastro, Italy |
| 2 Sep | | Born | Esteban Antonio Aguado Rojas † | | Bishop of Pamplona, Spain |
| 3 Sep | 40.4 | Appointed | Kornyliy (Korneliusz) Lebetskyi-Stolpovytskyi (Lebiecki), O.S.B.M. † | Bishop of Volodymyr (Włodzimierz) et Brėst (Ukrainian) |
| 4 Sep | 45.0 | Ordained Bishop | Antonio Maria Ghislieri † | Titular Bishop of Azotus |
| 6 Sep | | Born | Filippo Carandini † | | Cardinal, Cardinal-Deacon of Sant’Eustachio |
| 7 Sep | 47.8 | Appointed | Giovanni Crisostomo Calvi, O.P. † | Bishop of Montefeltro, Italy |
| 58.9 | Appointed | Pietro de Carolis † | Titular Archbishop of Traianopolis in Rhodope |
| 61.9 | Appointed | Giovanni Antonio Cavedi (Chevedo), O.F.M. † | Coadjutor Bishop of Comacchio, Italy | Bishop |
| 61.9 | Appointed | Giovanni Antonio Cavedi (Chevedo), O.F.M. † | Titular Bishop of Eucarpia | Bishop of Comacchio, Italy |
| 55.9 | Appointed | Franciszek Kaznowski † | Auxiliary Bishop of Poznań, Poland |
| 55.9 | Appointed | Franciszek Kaznowski † | Titular Bishop of Domitiopolis | Auxiliary Bishop of Poznań, Poland |
| 42.7 | Appointed | Stephanus Ladislaus Luzénszky † | Titular Bishop of Thyatira |
| 47.2 | Confirmed | Franz Georg von Schönborn † | Archbishop of Trier, Germany |
| 42.6 | Confirmed | Gregorius Sorger † | Bishop of Transilvania, Erdély, Siebenbürgen, Romania |
| 11 Sep | 61.9 | Ordained Bishop | Giovanni Antonio Cavedi (Chevedo), O.F.M. † | Titular Bishop of Eucarpia | Bishop of Comacchio, Italy |
| Born | Antonio María de los Reyes Almada, O.F.M. Obs. † | | Bishop of Sonora, México |
| 48.6 | Ordained Bishop | Casimiro Rossi Reyna, O.F.M. Obs. † | Titular Bishop of Capsus |
| 14 Sep | 73.7 | Selected | Luke Fagan † | Archbishop of Dublin, Ireland |
| 48.7 | Selected | Stephen MacEgan, O.P. † | Bishop of Meath, Ireland |
| 49.7 | Selected | Ambrose O’Callaghan, O.F.M. Ref. † | Bishop of Ferns, Ireland |
| 17 Sep | 46.3 | Selected | Juan de Galabis, O. Praem. † | Archbishop of Santo Domingo, Dominican Republic | Archbishop of Santafé en Nueva Granada, Colombia |
| 18 Sep | 59.0 | Ordained Bishop | Pietro de Carolis † | Titular Archbishop of Traianopolis in Rhodope |
| 54.3 | Ordained Bishop | Otto Honorius von Egkh und Hungersbach † | Titular Bishop of Thermopylae | Auxiliary Bishop of Olomouc (Olmütz), Czechia |
| 50.0 | Ordained Bishop | Jean Baptiste Gillis † | Titular Bishop of Amyzon | Auxiliary Bishop of Ličge, Belgium |
| 57.1 | Ordained Bishop | Johann Baptist Haus † | Titular Bishop of Messalum | Auxiliary Bishop of Basel, Switzerland |
| 61.9 | Ordained Bishop | Charles-Hyacinthe (Louis) Hugo, O. Praem. † | Titular Bishop of Ptolemais in Phoenicia |
| 23 Sep | 37.7 | Ordained Priest | Ioan Inocențiu Klein (Micu), O.S.B.M. † | Priest of Basilian Order of Saint Josaphat (Order of St. Basil the Great) | Bishop Emeritus of Făgăraş (Romanian), Romania |
| 24 Sep | 73.7 | Confirmed | Luke Fagan † | Archbishop of Dublin, Ireland |
| 21.8 | Ordained Priest | Franjo Klobusiczky † | Priest | Archbishop of Kalocsa, Hungary |
| 23.0 | Ordained Priest | Carlo Rosati † | Priest | Bishop of Alife, Italy |
| 24.5 | Ordained Priest | Nicola Spedalieri † | Priest | Bishop of Oppido Mamertina, Italy |
| 25 Sep | 26.7 | Ordained Bishop | Paul d’Albert de Luynes † | Bishop of Bayeux, France | Cardinal, Archbishop of Sens, France |
| 21.0 | Ordained Priest | Leopold Ernst von Firmian † | Priest of Passau, Germany | Cardinal, Bishop |
| 26 Sep | 48.7 | Appointed | Stephen MacEgan, O.P. † | Apostolic Administrator of Clonmacnoise, Ireland | Bishop of Meath, Ireland |
| 48.7 | Confirmed | Stephen MacEgan, O.P. † | Bishop of Meath, Ireland |
| 49.7 | Confirmed | Ambrose O’Callaghan, O.F.M. Ref. † | Bishop of Ferns, Ireland |
| 29 Sep | 23.0 | Ordained Priest | Francesco Broccoli † | Priest | Bishop of Polignano (Polinianum), Italy |
| 30 Sep | | Born | Stefano Domenico Sceriman, O.P. † | | Bishop of Chioggia, Italy |
| 2 Oct | | Born | Jerónimo Gómez de Lińán de la Borda † | | Bishop of Cartagena, Colombia |
| 3 Oct | 62.9 | Confirmed | Jean Grillet, O.P. † | Bishop of Aosta, Italy |
| 55.5 | Appointed | Giovanni Battista Senzasoni † | Titular Bishop of Olympus (Olimpus) |
| 5 Oct | 43.7 | Died | Manuel José de Hendaya y Haro † | Bishop of Oviedo, Spain |
| 9 Oct | 62.9 | Ordained Bishop | Jean Grillet, O.P. † | Bishop of Aosta, Italy |
| Born | Francisco José Marán † | | Bishop of Santiago de Chile |
| 49.7 | Ordained Bishop | Ambrose O’Callaghan, O.F.M. Ref. † | Bishop of Ferns, Ireland |
| 12 Oct | 64.7 | Died | Juan Fernández Zapata † | Bishop of León, Spain |
| 14 Oct | 52.2 | Installed | Juan José de Escalona y Calatayud † | Bishop of Michoacán, México |
| 15 Oct | 48.4 | Selected | Augustin-Roch de Menou de Charnisai † | Bishop of La Rochelle, France |
| 45.7 | Selected | François-Honoré-Lancelot de Casaubon de Maniban † | Archbishop of Bordeaux, France |
| 16 Oct | 50.4 | Ordained Bishop | Winimar Knippschild, O.S.B. † | Titular Bishop of Myndus | Auxiliary Bishop of Paderborn, Germany |
| Born | Antonio de Luna, O.F.M. Disc. † | | Bishop of Nueva Caceres, Philippines |
| 18 Oct | 47.3 | Ordained Priest | Franz Georg von Schönborn † | Priest | Archbishop of Trier, Germany |
| 26 Oct | 59.8 | Died | Zozuno Valignari † | Titular Archbishop of Thessalonica |
| 27 Oct | | Born | Gherardo Cortenovis, B. † | | Vicar Apostolic of Ava e Pegů, Myanmar |
| 30 Oct | | Born | Iledfonso Núńez de Haro y Peralta † | | Archbishop of México, Federal District |
| 47.3 | Ordained Bishop | Franz Georg von Schönborn † | Archbishop of Trier, Germany |
| Nov | 74.0 | Died | Costanzo Giordano, O.C.D. † | Archbishop of Sassari, Italy |
| 1 Nov | 47.8 | Selected | José Sancho Granado † | Bishop of Salamanca, Spain |
| 4 Nov | 24.3 | Ordained Priest | Antonio Maria Franci † | Priest | Bishop of Grosseto, Italy |
| 5 Nov | 83.6 | Died | Domenico Diez de Aux † | Bishop of Gerace, Italy |
| 6 Nov | 20.0 | Professed | Konstantin Schütz von Holzhausen, O.S.B. † | Member of Order of Saint Benedict | Auxiliary Bishop of Fulda, Germany |
| 7 Nov | 47.9 | Ordained Priest | José Sancho Granado † | Priest | Bishop of Salamanca, Spain |
| 9 Nov | | Born | Andrea Cardamone † | | Archbishop of Rossano, Italy |
| 13 Nov | 51.8 | Died | Carlos Bermudez de Castro † | Archbishop of Manila, Philippines |
| 14 Nov | 73.8 | Resigned | François de Nettancourt d’Haussonville de Vaubecourt † | Bishop of Montauban, France | Bishop Emeritus |
| 19 Nov | 68.5 | Died | Paolo Stabile, O.M. † | Bishop of Bova, Italy |
| Born | Cayetano Velozo, O.F.M. Ref. † | | Bishop of Săo Tomé e Príncipe |
| 20 Nov | 67.8 | Died | Nicolas Gervaise † | Titular Bishop of Horrea |
| 56.1 | Ordained Bishop | Franciszek Kaznowski † | Titular Bishop of Domitiopolis | Auxiliary Bishop of Poznań, Poland |
| 25 Nov | 60.3 | Died | Johann Matthias von Eyss † | Auxiliary Bishop of Trier, Germany |
| 22.0 | Ordained Deacon | Johann Franz Anton von Kevenhüller † | Deacon of Augsburg, Germany | Bishop Emeritus of Wiener Neustadt, Austria |
| 67.4 | Died | László Nádasdy, O.S.Pauli † | Bishop of Csanád, Hungary |
| 28 Nov | 65.5 | Confirmed | Dionigi Gioacchino Belmont, O.S.M. † | Bishop of Alghero, Italy |
| 49.9 | Appointed | Giovanni Francesco Bossi, O.F.M. Conv. † | Bishop of Syros (e Milos), Greece | Archbishop of Naxos, Greece |
| 54.6 | Appointed | Giuseppe Caccia, O.F.M. † | Bishop of Cefalonia e Zante, Greece | Bishop Emeritus of Trogir (Traů), Croatia |
| 49.7 | Appointed | Lelio Valentino Contessini-Ettorio † | Bishop of Pula (Pola), Croatia |
| 46.5 | Confirmed | Juan de Galabis, O. Praem. † | Archbishop of Santo Domingo, Dominican Republic | Archbishop of Santafé en Nueva Granada, Colombia |
| 65.0 | Appointed | Pietro Galletti † | Bishop of Catania, Italy |
| 59.4 | Appointed | Apollonio Lupi, C.R.L. † | Titular Bishop of Hemeria (Himeria) |
| 55.2 | Appointed | Tommaso Giosafat Melina † | Titular Bishop of Zama Major | Bishop of Bova, Italy |
| 60.8 | Appointed | Giuseppe Antonio Silvestri † | Bishop of Termoli, Italy |
| 42.0 | Confirmed | Michel de Verthamon de Chavagnac † | Bishop of Montauban, France |
| 69.7 | Appointed | Jean Vivant † | Auxiliary Bishop of Strasbourg, France |
| 69.7 | Appointed | Jean Vivant † | Titular Bishop of Paros | Auxiliary Bishop of Strasbourg, France |
| 30 Nov | 49.7 | Ordained Bishop | Lelio Valentino Contessini-Ettorio † | Bishop of Pula (Pola), Croatia |
| 60.8 | Ordained Bishop | Giuseppe Antonio Silvestri † | Bishop of Termoli, Italy |
| Dec | 66.8 | Died | Marino Carmignano † | Bishop of Cava (de’ Tirreni), Italy |
| 1 Dec | 58.7 | Died | Pier Secondo Radicati de Cocconato † | Bishop of Osimo e Cingoli, Italy |
| 2 Dec | 60.2 | Died | Tommaso Di Grazia † | Bishop of Castellammare di Stabia, Italy |
| 8 Dec | 59.4 | Ordained Bishop | Apollonio Lupi, C.R.L. † | Titular Bishop of Hemeria (Himeria) |
| 10 Dec | 43.5 | Died | Karl Joseph von Kuenburg † | Bishop of Chiemsee, Germany |
| 11 Dec | 54.6 | Ordained Bishop | Giuseppe Caccia, O.F.M. † | Bishop of Cefalonia e Zante, Greece | Bishop Emeritus of Trogir (Traů), Croatia |
| 35.9 | Ordained Deacon | Mikołaj Dembowski † | Deacon | Bishop of Kamyanets-Podilskyi (Kamieniec), Ukraine |
| 40.7 | Ordained Bishop | Kornyliy (Korneliusz) Lebetskyi-Stolpovytskyi (Lebiecki), O.S.B.M. † | Bishop of Volodymyr (Włodzimierz) et Brėst (Ukrainian) |
| 12 Dec | | Born | Giuseppe Domenico Porqueddu † | | Bishop of Iglesias, Italy |
| 13 Dec | | Born | Francesco Polesini † | | Bishop of Poreč (Parenzo), Croatia |
| 14 Dec | | Born | Jan Józef Dembowski † | | Bishop of Kamyanets-Podilskyi (Kamieniec), Ukraine |
| 16 Dec | 65.3 | Died | Pedro de Fajardo (Guajardo), O.SS.T. † | Bishop of Buenos Aires, Argentina |
| 17 Dec | 23.1 | Ordained Priest | Francesco Antonio Attaffi † | Priest | Bishop of Nicotera, Italy |
| 18 Dec | 36.0 | Ordained Priest | Mikołaj Dembowski † | Priest | Bishop of Kamyanets-Podilskyi (Kamieniec), Ukraine |
| 21 Dec | 43.2 | Appointed | Joseph Franz Valerian Felix von Arco † | Bishop of Chiemsee, Germany |
| 23 Dec | 44.2 | Appointed | Giovanni Mercurino Arborio di Gattinara, B. † | Bishop of Alessandria (della Paglia), Italy |
| 49.2 | Appointed | Giuseppe Barone † | Bishop of Bova, Italy | Bishop of Calvi Risorta, Italy |
| 44.7 | Appointed | Ferdinando Agostino Bernabei, O.P. † | Bishop of Osimo e Cingoli, Italy |
| 40.1 | Appointed | Fabrizio Borgia † | Bishop of Ferentino, Italy |
| 60.5 | Appointed | Giovanni Battista Capuani † | Bishop of Belcastro, Italy |
| 38.3 | Confirmed | Hardouin de Châlon de Maisonnoble † | Bishop of Lescar, France |
| 47.6 | Confirmed | Carlo Vincenzo Maria Ferreri, O.P. † | Cardinal, Bishop of Vercelli, Italy |
| 47.6 | Installed | Carlo Vincenzo Maria Ferreri, O.P. † | Cardinal-Priest of Santa Maria in Via | Cardinal, Bishop of Vercelli, Italy |
| 48.0 | Confirmed | José Sancho Granado † | Bishop of Salamanca, Spain |
| 42.9 | Appointed | Simone Gritti † | Bishop of Acquapendente, Italy | Bishop Emeritus |
| 36.8 | Appointed | Giovanni Federico Orsini Rosa † | Bishop of Krk (Veglia), Croatia | Bishop of Nona (Nin), Croatia |
| 39.5 | Appointed | Giovanni Battista Tarugi † | Bishop of Chiusi, Italy |
| 49.3 | Confirmed | Antal Kázmér von Thurn und Valsassina † | Bishop of Beograd (-Smederevo), Serbia | Bishop of Pécs, Hungary |
| 51.9 | Appointed | Antonio Vladagni † | Bishop of Shkodrë (Scutari), Albania |
| 24 Dec | | Born | Manuel Abad y Lasierra, O.S.B. † | | Bishop Emeritus of Astorga, Spain |
| 25 Dec | 49.2 | Ordained Bishop | Giuseppe Barone † | Bishop of Bova, Italy | Bishop of Calvi Risorta, Italy |
| 27 Dec | 54.5 | Selected | Benjamin de L’Isle du Gast † | Bishop of Limoges, France |
| 32.8 | Selected | Charles-Antoine de la Roche-Aymon † | Bishop of Tarbes, France | Cardinal, Archbishop of Reims, France |
| 28 Dec | | Born | Augustin-René-Louis Le Mintier † | | Bishop of Tréguier, France |
| 30 Dec | 76.7 | Died | Johann Sigmund Zeller von und zu Leibersdorf † | Auxiliary Bishop of Freising, Germany |
| 31 Dec | 60.6 | Ordained Bishop | Giovanni Battista Capuani † | Bishop of Belcastro, Italy |
| 44.3 | Died | Louis-Joseph de Châteauneuf de Rochebonne † | Bishop of Carcassonne, France |
| 39.5 | Ordained Bishop | Giovanni Battista Tarugi † | Bishop of Chiusi, Italy |