| Date | Age | Event | Bishop | Title | Current Title |
| unknown | 35.0 | Ordained Bishop | Dominic Bellew † | Bishop of Killala, Ireland |
| 47.0 | Died | Alexander Bianchi † | Bishop of Pult, Albania |
| Died | Patrick Brady, O.F.M. † | Bishop of Dromore, Ireland |
| 23.3 | Ordained Priest | Etienne-Hubert de Cambacérčs † | Priest | Cardinal, Archbishop of Rouen, France |
| 62.6 | Died | Antonio Bonifacio Coelho † | Auxiliary Bishop of Lisboa {Lisbon}, Portugal |
| Born | Michael Collins † | Rossmore | Bishop of Ross, Ireland |
| 26.6 | Ordained Priest | William Coppinger † | Priest | Bishop of Cloyne, Ireland |
| 24.8 | Ordained Priest | Binkentios Coressi † | Priest | Vicar Apostolic of Constantinople, Turkey |
| Died | Gherardo Cortenovis, B. † | Vicar Apostolic of Ava e Pegů, Myanmar |
| 23.2 | Ordained Priest | Silvestro Granito † | Priest | Bishop of Cava e Sarno, Italy |
| 55.7 | Appointed | Carlo Rezzonico (Jr.) † | Archpriest of the Arcibasilica di San Giovanni in Laterano {Saint John Lateran Basilica} | Cardinal, Cardinal-Bishop of Porto e Santa Rufina |
| 55.0 | Appointed | Carlo Santacolomba † | Prelate of Santa Lucia del Mela, Italy |
| 23.9 | Ordained Priest | Philippe-François Sausin † | Priest | Bishop of Blois, France |
| 15.2 | Professed | Joaquim da Souza Saraiva, C.M. † | Member of Congregation of the Mission | Bishop of Peking [Beijing], China |
| 26.0 | Ordained Priest | Charles Tuohy † | Priest of Limerick, Ireland | Bishop |
| 55.8 | Ordained Bishop | Luis Velasco, O.F.M. † | Bishop of Paraguay |
| 71.0 | Died | Antonio Vigliarolo † | Auxiliary Bishop of Ostia (-Velletri), Italy |
| 1 Jan | 46.9 | Appointed | Joseph Adam Arco † | Bishop of Seckau, Austria |
| 3 Jan | 48.8 | Ordained Bishop | Jean-Gabriel d’Agay † | Titular Bishop of Canopus | Bishop of Perpignan-Elne, France |
| 8 Jan | 76.8 | Died | Dionigi Latomo † | Bishop of Alessano, Italy |
| 9 Jan | 37.2 | Ordained Bishop | Dominique de Lastic † | Bishop of (Saint-Lizier de) Couserans, France |
| 13 Jan | 62.7 | Died | Pierre-Augustin-Bernardin de Rosset de Rocozel de Fleury † | Bishop of Chartres, France |
| 73.8 | Died | Tommaso Struzzieri, C.P. † | Bishop of Todi, Italy |
| 16 Jan | 35.5 | Ordained Bishop | Henri-Benoit-Jules de Béthizy † | Bishop of Uzés, France |
| 23 Jan | 33.2 | Ordained Bishop | Claude-Marie Ruffo de Laric † | Bishop of Saint-Flour, France | Bishop Emeritus |
| 25 Jan | 46.4 | Died | Marcantonio Conti † | Bishop Emeritus of Pesaro, Italy |
| 26 Jan | 42.1 | Appointed | Charles-Joseph Compans de Brichanteau † | Bishop of Saint-Jean-de-Maurienne, France | Bishop Emeritus |
| 63.9 | Appointed | Michel Conseil † | Bishop of Chambéry, France |
| 27 Jan | 39.5 | Appointed | Charles-Eugčne de Valperga de Maglione † | Bishop of Nice, France | Bishop Emeritus |
| 28 Jan | 45.1 | Ordained Bishop | Valentin Anton von Schneid † | Titular Bishop of Corycus | Auxiliary Bishop of Regensburg, Germany |
| Feb | | Died | Miguel Moreno y Ollo † | Bishop of Ayacucho o Huamanga (Guamanga), Peru |
| 1 Feb | 66.2 | Died | Manuel de Abad e Illanar, O. Praem. † | Bishop of Arequipa, Peru |
| 4 Feb | | Born | Antonio Majthényi † | Bisztricsény | Auxiliary Bishop of Esztergom, Hungary |
| 6 Feb | | Born | Kazimierz Roch Dmochowski † | Ikaźń | Archbishop of Mohilev, Belarus |
| 17.7 | Professed | José da Santíssima Trindade Leite, O.F.M. † | Member of Order of Friars Minor | Bishop of Mariana, Brazil |
| 7 Feb | | Born | Gaspare Bernardo Pianetti † | Iesi | Cardinal, Bishop Emeritus of Viterbo e Tuscania, Italy |
| 19 Feb | 24.1 | Ordained Priest | Francesco Scipio Dondi Orologio † | Priest | Bishop of Padova {Padua}, Italy |
| 23.3 | Ordained Priest | Paolo Garzilli † | Priest | Bishop of Sessa Aurunca, Italy |
| 20 Feb | 62.2 | Died | Andrzej Mikołaj Stanisław Kostka Młodziejewski † | Bishop of Poznań, Poland |
| 22 Feb | | Born | Francesco di Paola Villadecani † | Messina | Cardinal, Archbishop of Messina, Italy |
| 24 Feb | | Born | Pasquale Giusti † | Mondragone | Auxiliary Bishop of Caserta, Italy |
| 26 Feb | 63.2 | Died | William Walton † | Vicar Apostolic of Northern District, England, Great Britain |
| Mar | 68.5 | Died | Henricus Celaja † | Bishop of Oria, Italy |
| 10 Mar | 64.0 | Ordained Bishop | Michel Conseil † | Bishop of Chambéry, France |
| 11 Mar | 23.0 | Ordained Priest | Giulio Maria Alvisini † | Priest | Bishop of Fossombrone, Italy |
| 24.8 | Ordained Priest | Filippo Ambrosi † | Priest | Bishop of Montalto (delle Marche), Italy |
| 76.0 | Died | Franz Joseph Friedrich Ambuel † | Bishop of Sion {Sitten}, Switzerland |
| 22.1 | Ordained Deacon | Nicola Coppola, C.O. † | Deacon of Confederation of Oratorians of St. Philip Neri | Bishop of Nola, Italy |
| 23.9 | Ordained Priest | Pietro Maria d’Agostino † | Priest | Bishop of Agrigento (Girgenti), Italy |
| 25.4 | Ordained Deacon | István Fischer de Nagy † | Deacon of Eger, Hungary | Archbishop of Eger, Hungary |
| 23.3 | Ordained Priest | Vitale Loschi † | Priest | Bishop of Parma, Italy |
| 78.2 | Died | Niccola Sermattei † | Bishop of Assisi, Italy |
| 12 Mar | 44.2 | Ordained Bishop | Alexander MacDonald † | Titular Bishop of Polemonium | Vicar Apostolic of Highland District, Scotland, Great Britain |
| 26.2 | Ordained Priest | Marco Negri † | Priest | Bishop of Sapë, Albania |
| 15 Mar | | Born | Antonio Lao y Cuevas † | Tińana | Bishop of Guadix, Spain |
| 16 Mar | 65.8 | Died | Antonio Ripanti † | Bishop of Orvieto, Italy |
| 18 Mar | 78.1 | Resigned | Giovanni Carmine Pellerano, O.S.Io.Hieros. † | Bishop of Malta | Bishop Emeritus |
| 20 Mar | 52.8 | Succeeded | Jan Alojzy Aleksandrowicz † | Bishop of Chełm, Poland |
| 63.6 | Appointed | Nicola Ciafaglione (Cifaglione) † | Archbishop of Messina, Italy |
| 42.3 | Ordained Bishop | Charles-Joseph Compans de Brichanteau † | Bishop of Saint-Jean-de-Maurienne, France | Bishop Emeritus |
| Appointed | Josephus Albertus de Gaston de Pollier † | Titular Bishop of Thermae Basilicae |
| 39.0 | Appointed | Johann Valentin Heimes † | Auxiliary Bishop of Worms, Germany |
| 39.0 | Appointed | Johann Valentin Heimes † | Titular Bishop of Aulon | Auxiliary Bishop of Worms, Germany |
| 50.2 | Appointed | Augustin-René-Louis Le Mintier † | Bishop of Tréguier, France |
| 61.6 | Appointed | Albert Louis de Lichtervelde † | Bishop of Namur {Namen}, Belgium |
| 53.8 | Appointed | Giovanni Lotrecchi † | Bishop of Todi, Italy |
| 40.2 | Appointed | Jean-Baptiste-Joseph de Lubersac † | Bishop of Chartres, France | Bishop Emeritus |
| 50.8 | Succeeded | Antoni Onufry Okecki † | Bishop of Poznań, Poland |
| 74.4 | Appointed | Joseph Ferdinand Guidobald von Spaur und Valör † | Titular Bishop of Abila in Palaestina |
| 61.5 | Confirmed | Joseph Philipp Franz von Spaur † | Bishop of Brixen {Bressanone}, Italy |
| 21 Mar | 72.7 | Died | Francisco José Rodríguez Chico † | Bishop of Teruel, Spain |
| 22 Mar | 63.0 | Died | Giuseppe Ippoliti † | Bishop of Pistoia e Prato, Italy |
| 25 Mar | | Born | José Antonio García Balsalobre y Rada, O.S. † | Torrubia del Campo, Spain | Titular Bishop of Tanis |
| Born | Giuseppe-Maria Molajoni, C.P. † | Roma | Bishop Emeritus of Nicopoli, Bulgaria |
| 27 Mar | 53.8 | Ordained Bishop | Giovanni Lotrecchi † | Bishop of Todi, Italy |
| 28 Mar | 39.6 | Ordained Bishop | Charles-Eugčne de Valperga de Maglione † | Bishop of Nice, France | Bishop Emeritus |
| 2 Apr | 52.3 | Ordained Bishop | Giovanni Damase Salutti, O.S.A. † | Bishop of Peking [Beijing], China |
| 6 Apr | 47.2 | Installed | Joseph Adam Arco † | Bishop of Seckau, Austria |
| 7 Apr | 69.2 | Died | Alonso Cano Nieto, O.SS.T. † | Bishop of Segorbe, Spain |
| 8 Apr | | Born | Salvador José Reyes y García de Lara † | La Zubía | Archbishop of Granada, Spain |
| 9 Apr | 48.6 | Ordained Bishop | Francesco Benincasa, S.J. † | Bishop of Carpi, Italy |
| 74.5 | Died | Giuseppe Maria Castelli † | Cardinal, Prefect of the Congregation for Propagation of the Faith |
| 58.5 | Ordained Bishop | Antônio Corręa, O.S.A. † | Archbishop of Săo Salvador da Bahia, Brazil |
| 14 Apr | 39.1 | Ordained Bishop | Johann Valentin Heimes † | Titular Bishop of Aulon | Auxiliary Bishop of Worms, Germany |
| 16 Apr | 55.6 | Ordained Bishop | Agustín Lezo Palomeque † | Bishop of Pamplona, Spain | Archbishop of Zaragoza, Spain |
| 22 Apr | | Born | Luigi Carsidoni † | Camerino | Bishop of Fano, Italy |
| 23 Apr | 42.4 | Installed | Charles-Joseph Compans de Brichanteau † | Bishop of Saint-Jean-de-Maurienne, France | Bishop Emeritus |
| 58.2 | Died | Romoaldo Guidi † | Cardinal, Cardinal-Deacon of San Giorgio in Velabro |
| Born | Ioan Lemeni † | Dezmir | Bishop Emeritus of Făgăraş (Romanian), Romania |
| 60.3 | Ordained Bishop | Diego Martín Rodríguez, O.F.M. † | Bishop of Ceuta, Spain | Bishop of Coria, Spain |
| 25 Apr | | Born | Josef Anton Salzmann † | Luzern | Bishop of Basel, Switzerland |
| 28 Apr | 75.5 | Resigned | Franz Heinrich Wendelin von Kageneck † | Auxiliary Bishop of Eichstätt, Germany | Auxiliary Bishop Emeritus |
| 29 Apr | | Born | Manuel Ramón Arias Teijeiro de Castro † | Cabanelas | Bishop Emeritus of Santander, Spain |
| 47.6 | Resigned | Jacinto Carlos da Silveira † | Bishop of Săo Luís do Maranhăo, Brazil | Bishop Emeritus |
| 30 Apr | 64.1 | Installed | Michel Conseil † | Bishop of Chambéry, France |
| 50.3 | Ordained Bishop | Augustin-René-Louis Le Mintier † | Bishop of Tréguier, France |
| 2 May | 49.5 | Appointed | Leonardo Antonelli † | Prefect of the Congregation for Propagation of the Faith | Cardinal, Cardinal-Bishop of Ostia (e Velletri) |
| 7 May | 63.7 | Ordained Bishop | Nicola Ciafaglione (Cifaglione) † | Archbishop of Messina, Italy |
| 36.7 | Ordained Priest | Francesco Maria d’Este † | Priest | Bishop of Reggio Emilia, Italy |
| 53.3 | Ordained Bishop | Ludwik Józef de Mathy † | Titular Bishop of Tanis | Auxiliary Bishop of Poznań, Poland |
| 8 May | 37.3 | Ordained Priest | Joseph Konrad von Schroffenberg, C.R.S.A. † | Priest of Confederation of Canons Regular of St. Augustine | Bishop of Freising, Germany |
| 10 May | 46.7 | Died | Franciszek Komornicki † | Auxiliary Bishop of Lutsk (Łuck), Ukraine |
| 20 May | 24.0 | Ordained Priest | Louis-Jules-François-Joseph d’Andigné de Mayneuf † | Priest | Bishop of Nantes, France |
| 39.2 | Ordained Priest | Lourenço Correa de Sá e Benevides † | Priest | Bishop of Porto, Portugal |
| 22.9 | Ordained Priest | Ambrosi de Magistris † | Priest of Napoli {Naples}, Italy | Auxiliary Bishop |
| 23.7 | Ordained Priest | Pietro Paolo Mazzichi † | Priest | Bishop of Montalto (delle Marche), Italy |
| 26.9 | Ordained Priest | Joaquim Maria Mascarenhas Castello Branco † | Priest | Bishop Emeritus of Angola e Congo, Angola |
| 29.7 | Ordained Priest | Luigi Ruffo Scilla † | Priest | Cardinal, Archbishop of Napoli {Naples}, Italy |
| 62.9 | Appointed | Domenico Russo † | Bishop of Monopoli, Italy |
| 22.3 | Ordained Deacon | Franz Ignaz von Streber † | Deacon of Other | Auxiliary Bishop of München und Freising {Munich}, Germany |
| 22 May | 54.1 | Died | Giambattista Ettore Caracciolo, C.R. † | Archbishop of Bari (-Canosa), Italy |
| 24 May | 50.6 | Installed | Francisco José Marán † | Bishop of Concepción, Chile | Bishop of Santiago de Chile |
| 25 May | 92.4 | Died | Louis-Armand Chomel † | Bishop Emeritus of Orange, France |
| Born | Andrea Jourdain † | Saint-André | Bishop of Aosta, Italy |
| 26 May | 51.4 | Selected | Franz Melchior Joseph Zen-Ruffinen † | Bishop of Sion {Sitten}, Switzerland |
| 30 May | | Born | Giovanni Tommaso Neuschel † | Szepesváralja | Bishop Emeritus of Parma, Italy |
| 6 Jun | | Born | Salvatore Lettieri † | Foggia | Bishop of Nardň, Italy |
| 74.6 | Ordained Bishop | Joseph Ferdinand Guidobald von Spaur und Valör † | Titular Bishop of Abila in Palaestina |
| 8 Jun | | Born | William Crolly † | Ballykilbeg | Archbishop of Armagh, Ireland |
| 13 Jun | 61.8 | Ordained Bishop | Albert Louis de Lichtervelde † | Bishop of Namur {Namen}, Belgium |
| 16 Jun | 58.1 | Resigned | Konstanty Leon Sosnowski, O.S.P. † | Auxiliary Bishop of Inflanty (Livonia), Poland | Auxiliary Bishop Emeritus |
| 17 Jun | 46.2 | Appointed | Matthew Gibson † | Vicar Apostolic of Northern District, England, Great Britain |
| 46.2 | Appointed | Matthew Gibson † | Titular Bishop of Comana Armeniae | Vicar Apostolic of Northern District, England, Great Britain |
| 18 Jun | 78.5 | Died | Jean-Louis de Gouyon de Vaudurand † | Bishop Emeritus of Saint-Pol-de-Léon, France |
| 23.7 | Ordained Priest | Joachim Józef Grabowski † | Priest | Auxiliary Bishop of Mohilev, Belarus |
| 19 Jun | 40.4 | Appointed | Scipione de’ Ricci † | Bishop of Pistoia e Prato, Italy | Bishop Emeritus |
| 54.3 | Died | Ferdinando de Vicariis, O.S.B. † | Bishop of Melfi e Rapolla, Italy |
| 62.7 | Appointed | Julián Gascueńa Herráiz, O.F.M. † | Bishop of Jaca, Spain | Bishop of Avila, Spain |
| 49.4 | Appointed | Adam Kościa † | Auxiliary Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania |
| 49.4 | Appointed | Adam Kościa † | Titular Bishop of Dioclea | Auxiliary Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania |
| 45.1 | Appointed | Vincenzo Labini, O.S.Io.Hieros. † | Bishop of Malta |
| 78.4 | Appointed | Giovanni Carmine Pellerano, O.S.Io.Hieros. † | Titular Archbishop of Rhodus | Bishop Emeritus of Malta |
| 48.2 | Appointed | Georgius Powslowski † | Auxiliary Bishop of Inflanty (Livonia)-Pilten, Poland |
| 48.2 | Appointed | Georgius Powslowski † | Titular Bishop of Alalis | Auxiliary Bishop of Inflanty (Livonia)-Pilten, Poland |
| 21 Jun | 59.7 | Died | Martin Nugk von Lichtenhoff † | Prefect of Meißen (Meissen) {Lusazia o Lausitz; Sassonia}, Germany |
| 24 Jun | | Born | Cornelius Egan † | Lismickfinan | Bishop of Kerry (o Ardfert) e Aghadoe, Ireland |
| 25 Jun | 40.4 | Ordained Bishop | Scipione de’ Ricci † | Bishop of Pistoia e Prato, Italy | Bishop Emeritus |
| 45.2 | Ordained Bishop | Vincenzo Labini, O.S.Io.Hieros. † | Bishop of Malta |