| Date | Age | Event | Bishop | Title | Current Title |
| unknown | | Born | Pierre Elie XII Abboloyonan † | Mossul | Patriarch of Babylon {Babilonia} (Chaldean), Iraq |
| 33.7 | Ordained Deacon | Giacomo Antonelli † | Cardinal, Deacon of the Roman Curia - Other |
| 66.4 | Died | Giovanni Maria Bua † | Archbishop of Oristano, Italy |
| Succeeded | Patrick Joseph Carew † | Vicar Apostolic of Madras, India | Vicar Apostolic of Western Bengal, India |
| 64.2 | Appointed | Girolamo Gavi † | Titular Bishop of Meloë in Lycia | Bishop of Livorno, Italy |
| 46.9 | Selected | Guilherme Henriques de Carvalho † | Bishop of Leiria, Portugal | Cardinal, Patriarch of Lisboa {Lisbon}, Portugal |
| 24.7 | Ordained Priest | Florentin-Etienne Jaussen, SS.CC. † | Priest of Congregation of the Sacred Hearts of Jesus and Mary | Vicar Apostolic Emeritus of Tahiti {Isole Tahiti}, French Polynesia, Pacific (Oceania) |
| Died | Michele Amatore Lobetti † | Bishop of Asti, Italy |
| 64.4 | Died | Vincenzo Macioti † | Bishop of Ferentino, Italy |
| Died | Daniel O’Connell (O’Connor), O.S.A. † | Vicar Apostolic of Madras, India |
| Appointed | Carlos Pereira Freire de Moura † | Bishop of Mariana, Brazil | Bishop-Elect |
| Died | Carlos Pereira Freire de Moura † | Bishop-Elect of Mariana, Brazil |
| 52.2 | Died | Francesco Pichi † | Bishop of Tivoli, Italy |
| 22.7 | Ordained Priest | Henryk Ludwik Plater † | Priest | Auxiliary Bishop of Warszawa {Warsaw}, Poland |
| 73.9 | Selected | Francisco de São Luiz (Manoel Justiniano) Saraiva, O.S.B. † | Cardinal, Patriarch of Lisboa {Lisbon}, Portugal |
| 83.0 | Died | Isidoro Spano † | Auxiliary Bishop of Mazara del Vallo, Italy |
| 58.0 | Died | Antonio Raimondo Tore † | Archbishop of Cagliari, Italy |
| 19.9 | Professed | Giuseppe Antonio Virdia, O.F.M. Conv. † | Member of Order of Friars Minor Conventual | Bishop Emeritus of Cariati, Italy |
| Jan | 45.3 | Resigned | William Placid Morris, O.S.B. † | Vicar Apostolic of Cape of Good Hope, Western District {Capo di Buona Speranza, Distretto Occidentale}, South Africa | Vicar Apostolic Emeritus |
| 3 Jan | 83.2 | Died | Patrício da Silva, O.S.A. † | Cardinal, Patriarch of Lisboa {Lisbon}, Portugal |
| 4 Jan | | Born | Richard Owens † | Brookeboro, Co Fermanagh | Bishop of Clogher, Ireland |
| 6 Jan | | Born | Charles Lavigne, S.J. † | Marvejols, France | Bishop of Trincomalee, Sri Lanka |
| Born | Jean-Louis Vey, M.E.P. † | Araules, France | Vicar Apostolic of Eastern Siam {Siam Orientale}, Thailand |
| 8 Jan | | Born | Vito Antonio Fioni † | Bitritto | Bishop Emeritus of Larino, Italy |
| 10 Jan | | Born | Louis Nazaire Bégin † | La Pointe-Lévis | Cardinal, Archbishop of Québec, Canada |
| Born | Thomas Martin Aloysius Burke † | Swinford, Ireland | Bishop of Albany, New York, USA |
| 12 Jan | | Born | Silvério Gomes Pimenta † | Congonhas do Campo | Archbishop of Mariana, Minas Gerais, Brazil |
| Appointed | Ludovico Rizzuti † | Archbishop of Lanciano (e Ortona), Italy |
| 67.8 | Died | Carlo Emmanuelle Sardagna de Hohenstein † | Bishop Emeritus of Cremona, Italy |
| 13 Jan | 70.1 | Died | Kajetan von Kowalski † | Auxiliary Bishop of Gniezno-Poznań, Poland |
| 14 Jan | 52.5 | Succeeded | Rémi Gaulin † | Bishop of Kingston, Ontario, Canada |
| 77.5 | Died | Alexander MacDonell † | Bishop of Kingston, Ontario, Canada |
| 17 Jan | | Born | Vincenzo Giuseppe Veneri † | Norcia | Bishop of Amelia, Italy |
| 19 Jan | 48.9 | Ordained Bishop | Pietro Raffaelli † | Bishop of Carpi, Italy | Bishop of Reggio Emilia, Italy |
| 20 Jan | | Born | Giuseppe Staiti di Brancaleone † | Napoli | Bishop of Andria, Italy |
| 24 Jan | | Born | George John Smith † | Cuttlebrue | Bishop of Argyll and The Isles, Scotland, Great Britain |
| 2 Feb | | Born | Pierre-Emile-Jean-Baptiste-Marie Grouard, O.M.I. † | Brûlon, France | Vicar Apostolic Emeritus of Grouard, Alberta, Canada |
| 54.9 | Professed | Carlo Odescalchi, S.J. † | Priest of Society of Jesus |
| Born | Gustave Augustin Rouxel † | Redon, France | Auxiliary Bishop of New Orleans, Louisiana, USA |
| 13 Feb | | Born | Jordan Zaninovic, O.P. † | Stari Grad | Bishop of Hvar (-Brac e Vis), Croatia |
| 14 Feb | 38.1 | Appointed | William Bernard Allen Collier, O.S.B. † | Vicar Apostolic of Cape of Good Hope {Capo de Buona Speranza}, South Africa | Bishop Emeritus of Port-Louis, Mauritius |
| 38.1 | Appointed | William Bernard Allen Collier, O.S.B. † | Titular Bishop of Milevum | Bishop Emeritus of Port-Louis, Mauritius |
| 16 Feb | 36.2 | Ordained Bishop | Miguel Calderón, O.P. † | Titular Bishop of Bodona | Vicar Apostolic of Fo-Kien, China |
| 22 Feb | 65.1 | Died | Felice Greco † | Bishop of San Marco e Bisignano, Italy |
| 90.8 | Died | Fortuné-Charles de Mazenod † | Bishop Emeritus of Marseille, France |
| 25 Feb | 35.0 | Ordained Bishop | Heinrich von Hofstätter † | Bishop of Passau, Germany |
| 52.8 | Ordained Bishop | Louis-Robert Paysant † | Bishop of Angers, France |
| 47.9 | Ordained Bishop | Marie-Dominique-Auguste Sibour † | Bishop of Digne, France | Archbishop of Paris, France |
| 28 Feb | | Born | Thomas Joseph Dowling † | Limerick, Ireland | Bishop of Hamilton, Ontario, Canada |
| 1 Mar | 37.8 | Ordained Bishop | François-Alexis Rameaux, C.M. † | Titular Bishop of Myrina | Vicar Apostolic of Kiam-Si {Kiangsi}, China |
| 2 Mar | 23.6 | Ordained Priest | Juan Francisco de Paula Solar Mery, O. de M. † | Priest of Order of Our Lady of Mercy | Bishop of San Carlos de Ancud, Chile |
| 7 Mar | 51.0 | Ordained Bishop | Vincenzo Menchi † | Bishop of Pescia, Italy | Bishop of Fiesole, Italy |
| 8 Mar | 82.1 | Died | Giuseppe Segna † | Bishop of Marsi, Italy |
| 9 Mar | | Born | Francesco Saverio de Hornstein † | Villars-sur-Fontenais | Archbishop of Bucarest {Bucureşti}, Romania |
| 14 Mar | 47.9 | Installed | Marie-Dominique-Auguste Sibour † | Bishop of Digne, France | Archbishop of Paris, France |
| 15 Mar | | Born | Paolo Carlo Francesco Origo † | Milano | Bishop of Mantova, Italy |
| 16 Mar | 69.3 | Selected | Franciszek Ksawery Zachariasiewicz † | Bishop of Przemyśl, Poland |
| 17 Mar | | Born | Jacques Roissant † | Bommiers, France | Auxiliary Bishop of Nicopoli, Bulgaria |
| 18 Mar | 57.1 | Selected | Alexis Billiet † | Cardinal, Archbishop of Chambéry, France |
| 21 Mar | 82.0 | Died | Adam Friedrich von Groß zu Trockau † | Bishop of Würzburg, Germany |
| 22 Mar | 71.7 | Died | Georg Mayer † | Bishop of Gurk, Austria |
| 25 Mar | | Born | Pasquale de Siena † | Napoli | Auxiliary Bishop of Napoli {Naples}, Italy |
| 29 Mar | 64.2 | Ordained Bishop | José Manuel Eufrasio de Quiroga Sarmiento † | Bishop of San Juan de Cuyo, Argentina |
| 1 Apr | 16.2 | Professed | Alfonso Capecelatro di Castelpagano, C.O. † | Member of Confederation of Oratorians of St. Philip Neri | Cardinal, Archbishop of Capua, Italy |
| Born | Antonio Dias Ferreira † | Pombeiro, Portugal | Bishop Emeritus of Angola e Congo, Angola |
| 3 Apr | 77.6 | Died | Marie-Joseph-Antoine-Laurent de la Rivoire de La Tourette † | Bishop of Valence, France |
| 4 Apr | 23.2 | Ordained Priest | Filippo Campus Chessa † | Priest | Bishop of Ampurias e Tempio, Italy |
| Born | Johann Baptist von Neudecker † | Thalham | Auxiliary Bishop of München und Freising {Munich}, Germany |
| 22.9 | Ordained Priest | Giovanni Pierallini † | Priest | Archbishop of Siena, Italy |
| 5 Apr | 23.1 | Ordained Priest | Patrick Neeson Lynch † | Priest of Charleston, South Carolina, USA | Bishop |
| 6 Apr | | Born | Fulco Luigi Ruffo-Scilla † | Palermo | Cardinal, Official of the Roman Curia - Other |
| 9 Apr | 66.1 | Died | Johann Wilhelm Bausch † | Bishop of Limburg, Germany |
| Born | Giuliano Cabras † | Bessude | Auxiliary Bishop of Sassari, Italy |
| 11 Apr | 77.5 | Retired | José Ignacio Cienfuegos Arteaga † | Bishop of Concepción, Chile |
| 12 Apr | 43.2 | Appointed | John Timon, C.M. † | Prefect of Texas, USA | Bishop of Buffalo, New York, USA |
| 17 Apr | 78.3 | Appointed | Carlo Rajner † | Auxiliary Bishop of Eger, Hungary |
| 78.3 | Appointed | Carlo Rajner † | Titular Bishop of Amorium | Auxiliary Bishop of Eger, Hungary |
| 35.1 | Selected | Georg Anton von Stahl † | Bishop of Würzburg, Germany |
| 18 Apr | 26.5 | Ordained Priest | César-Victor-Ange-Jean-Baptiste Jourdan † | Priest of Paris, France | Bishop of Tarbes, France |
| 19 Apr | 40.5 | Succeeded | Ignace Bourget † | Bishop of Montréal, Québec, Canada | Bishop Emeritus |
| 62.8 | Died | Jean-Jacques Lartigue, P.S.S. † | Bishop of Montréal, Québec, Canada |
| 20 Apr | 81.7 | Died | Bartolomeo Goglia † | Bishop of Sant’Angelo dei Lombardi-Bisaccia, Italy |
| 21 Apr | | Born | Alphonse de Voss (Vos), C.I.C.M. † | Messines, Belgium | Vicar Apostolic of Southwestern Mongolia {Mongolia Occiduo-Meridionale}, China |
| 23 Apr | | Born | Nicolae Iosif Camilli † | Monterubbiano, Italy | Bishop of Iaşi, Romania |
| 24 Apr | | Born | Jean-Baptiste-Hippolyte Sarthou, C.M. † | Doazit, France | Vicar Apostolic of Northern Chi-Li {Ce-Li Settentrionale} o Pe-Kin, China |
| 27 Apr | 46.6 | Appointed | Denis-Auguste Affre † | Titular Bishop of Pompeiopolis in Cilicia | Archbishop of Paris, France |
| 46.6 | Confirmed | Denis-Auguste Affre † | Coadjutor Bishop of Strasbourg, France | Archbishop of Paris, France |
| 53.6 | Appointed | Raffaele Biale † | Bishop of Albenga, Italy |
| 57.2 | Confirmed | Alexis Billiet † | Cardinal, Archbishop of Chambéry, France |
| 52.5 | Confirmed | Louis-Jacques-Maurice de Bonald † | Cardinal, Archbishop of Lyon (-Vienne), France |
| 60.8 | Confirmed | Nicolas-Augustin de la Croix d’Azolette † | Archbishop of Auch, France | Archbishop Emeritus |
| 61.2 | Appointed | Diego Antonio Elizondo y Prado † | Bishop of Concepción, Chile |
| 54.6 | Appointed | Francisco José Vicente Garcia Diego y Moreno, O.F.M. † | Bishop of California (Two Californias, Both Californias), México |
| 57.1 | Appointed | Joseph Ambrosius Geritz † | Auxiliary Bishop of Warmia (Ermland), Poland | Bishop |
| 57.1 | Appointed | Joseph Ambrosius Geritz † | Titular Bishop of Abdera | Bishop of Warmia (Ermland), Poland |
| 51.7 | Appointed | Giuseppe Godeassi † | Bishop of Split-Makarska (Spalato-Macarska), Croatia | Archbishop of Zadar (Zara), Croatia |
| 64.3 | Appointed | Juan Manuel de Irrizarri y Peralta † | Auxiliary Bishop of México, Federal District |
| 64.3 | Appointed | Juan Manuel de Irrizarri y Peralta † | Titular Bishop of Caesarea Philippi | Auxiliary Bishop of México, Federal District |
| 51.2 | Appointed | Mario Giuseppe Mirone † | Bishop of Valva e Sulmona, Italy | Bishop of Noto, Italy |
| 39.7 | Appointed | Giuseppe Agostino Salomoni, C.M. † | Bishop of Cuneo, Italy | Bishop Emeritus |
| 42.1 | Appointed | Nicola Sterlini † | Bishop of Calvi e Teano, Italy |
| Confirmed | Nicolas Zeia (Zaya) † | Patriarch of Babylon {Babilonia} (Chaldean), Iraq | Patriarch Emeritus |
| 1 May | 80.7 | Died | Jean-Marie-Dominique de Poulpiquet de Brescanvel † | Bishop of Quimper, France |
| 3 May | 38.3 | Ordained Bishop | William Bernard Allen Collier, O.S.B. † | Titular Bishop of Milevum | Bishop Emeritus of Port-Louis, Mauritius |
| 39.7 | Ordained Bishop | Giuseppe Agostino Salomoni, C.M. † | Bishop of Cuneo, Italy | Bishop Emeritus |
| 7 May | | Born | Félix-Nicolas-Joseph Midon, M.E.P. † | Bonviller, France | Bishop of Osaka, Japan |
| 13 May | 48.1 | Died | Jose Epigmenio Villanueva y Gomez de Eguiarreta † | Bishop-Elect of Antequera, Oaxaca, México |
| 14 May | | Born | Gregorio Govrik, C.A.M. † | Vienna, Italy | Abbot of Congregazione Mechitarista di Venezia |
| 21 May | 62.1 | Appointed | Manuel Vicuña Larraín † | Archbishop of Santiago de Chile |
| 22 May | 37.8 | Appointed | Nicholas Patrick Stephen (Nicolás Patricio Esteban) Wiseman † | Vicar Apostolic of Midland District, England, Great Britain | Cardinal, Archbishop of Westminster, England, Great Britain |
| 37.8 | Appointed | Nicholas Patrick Stephen (Nicolás Patricio Esteban) Wiseman † | Titular Bishop of Milopotamos | Cardinal, Archbishop of Westminster, England, Great Britain |
| 23 May | 54.3 | Ordained Bishop | José María Arriaga † | Bishop of Maynas, Peru | Bishop of Chachapoyas, Peru |
| 24 May | 43.2 | Ordained Bishop | Manoel de Monte Rodrigues de Araújo † | Bishop of São Sebastião do Rio de Janeiro, Brazil |
| 26 May | 46.7 | Selected | Denis-Auguste Affre † | Archbishop of Paris, France |
| 44.9 | Selected | Pierre Chatrousse † | Bishop of Valence, France |
| 37.5 | Selected | Pierre-Marie-Joseph Darcimoles † | Bishop of Le Puy-en-Velay, France | Archbishop of Aix (-Arles-Embrun), France |
| 48.1 | Selected | Thomas-Marie-Joseph Gousset † | Cardinal, Archbishop of Reims, France |
| 47.2 | Selected | Jean-Marie Graveran † | Bishop of Quimper, France | Bishop of Quimper [Cornouailles](-Léon), France |
| 28 May | | Born | Ferdinando Maria Cieri † | Castelfranci | Bishop of Sant’Agata de’ Goti, Italy |
| Born | Johann Baptist Schneider † | Gaweinsthal | Auxiliary Bishop of Wien {Vienna}, Austria |
| 30 May | | Born | Antonius Hubert Fischer † | Jülich | Cardinal, Archbishop of Köln {Cologne}, Germany |
| 31 May | 59.7 | Ordained Bishop | Manuel Posada y Garduño † | Archbishop of México, Federal District |
| 37.0 | Ordained Bishop | Pierre-André Retord, M.E.P. † | Titular Bishop of Achantus | Vicar Apostolic of Western Tonking {Tonkino Occidentale}, Viêt Nam |
| Jun | 25.2 | Ordained Priest | Gregorio Melitón Martínez Santa Cruz † | Priest | Archbishop Emeritus of Manila, Philippines |
| 2 Jun | 26.4 | Incardinated | Nikolaus Adames † | Priest of Luxembourg | Bishop Emeritus of Luxembourg |
| 70.8 | Appointed | Johann Theodor van der Noot † | Vicar Apostolic of Luxembourg | Vicar Apostolic Emeritus |
| 44.8 | Appointed | Joannes Augustinus Paredis † | Vicar Apostolic of Limburg, Germany | Bishop of Roermond, Netherlands |
| 44.8 | Appointed | Joannes Augustinus Paredis † | Titular Bishop of Hirina | Bishop of Roermond, Netherlands |
| Born | John Lancaster Spalding † | Lebanon, KY | Bishop Emeritus of Peoria, Illinois, USA |
| Born | Jakobus von Stammler † | Bremgarten | Bishop of Basel e Lugano, Switzerland |
| 5 Jun | 56.4 | Appointed | George Hilary Brown † | Vicar Apostolic of Lancashire District, England, Great Britain | Bishop of Liverpool, England, Great Britain |
| 56.4 | Appointed | George Hilary Brown † | Titular Bishop of Bugia | Bishop of Liverpool, England, Great Britain |
| 44.1 | Appointed | Thomas Joseph Brown, O.S.B. † | Vicar Apostolic of Wales District, Wales, Great Britain | Bishop of Newport and Menevia, Wales, Great Britain |
| 44.1 | Appointed | Thomas Joseph Brown, O.S.B. † | Titular Bishop of Apollonia | Bishop of Newport and Menevia, Wales, Great Britain |
| 49.3 | Appointed | William Wareing † | Vicar Apostolic of Eastern District, England, Great Britain | Bishop Emeritus of Northampton, England, Great Britain |
| 49.3 | Appointed | William Wareing † | Titular Bishop of Areopolis | Bishop Emeritus of Northampton, England, Great Britain |
| 6 Jun | | Born | Gabriele Neviani, O.F.M. † | Modena | Bishop Emeritus of Sapë, Albania |
| 8 Jun | 37.8 | Ordained Bishop | Nicholas Patrick Stephen (Nicolás Patricio Esteban) Wiseman † | Titular Bishop of Milopotamos | Cardinal, Archbishop of Westminster, England, Great Britain |
| 9 Jun | 22.8 | Ordained Priest | Richard Butler Roskell † | Priest | Bishop Emeritus of Nottingham, England, Great Britain |
| 11 Jun | 80.0 | Died | Antonio Begni † | Bishop of Monte Feltre, Italy |
| 13 Jun | 27.6 | Ordained Priest | John Bernard Fitzpatrick † | Priest of Boston, Massachusetts, USA | Bishop |
| 23.0 | Ordained Priest | Francesco Giampaolo † | Priest | Bishop Emeritus of Larino, Italy |
| 27.9 | Ordained Priest | Francis Kelly † | Priest | Bishop of Derry, Ireland |
| 13.2 | Ordained Priest | Guillaume-René Meignan † | Priest | Cardinal, Archbishop of Tours, France |
| 23.8 | Ordained Priest | Pierre-Julien Pichon, M.E.P. † | Priest | Vicar Apostolic of Southern Szechwan {Se-Ciuen Meridionale}, China |
| 23.5 | Ordained Priest | Mariano Positano † | Priest | Bishop of Castellaneta, Italy |
| 14 Jun | | Born | James Charles McDonald † | Allisary | Bishop of Charlottetown, Prince Edward Island, Canada |
| Born | Gustave-Adolphe de Pélacot † | Le Puy | Archbishop of Chambéry, France |
| 24 Jun | | Born | Cesare Boccanera † | Roma | Bishop Emeritus of Narni, Italy |
| 25 Jun | 50.5 | Selected | Louis Rossat † | Bishop of Gap, France | Bishop of Verdun, France |
| 26 Jun | | Born | Jose Maria Ignacio Montes de Oca y Obregón † | Guanajuato | Bishop of San Luis Potosí, México |