| Date | Age | Event | Bishop | Title | Current Title |
| 2 May | 66.4 | Installed | Jozef Bélik † | Bishop of Spiš, Slovakia |
| 66.1 | Appointed | Jerónimo Fernandez de Castro Delgado, O.SS.T. † | Bishop of Albarracin, Spain |
| 3 May | 69.3 | Appointed | Giovanni Battista Bussi † | Cardinal, Archbishop of Benevento, Italy |
| 69.3 | Appointed | Giovanni Battista Bussi † | Cardinal-Priest of S. Pancrazio | Cardinal, Archbishop of Benevento, Italy |
| 69.3 | Elevated to Cardinal | Giovanni Battista Bussi † | Cardinal, Archbishop of Benevento, Italy |
| 60.2 | Confirmed | Juan José Cordón Leyva † | Bishop of Guadix, Spain |
| 56.0 | Appointed | Pierre-Marie Cottret † | Titular Bishop of Carystus | Bishop of Beauvais, France |
| 62.1 | Appointed | Richard Kornelius Dammers † | Auxiliary Bishop of Paderborn, Germany | Bishop |
| 62.1 | Appointed | Richard Kornelius Dammers † | Titular Bishop of Tiberias | Bishop of Paderborn, Germany |
| 47.5 | Appointed | Joaquim de Nossa Senhora de Nazareth Oliveira e Abreu, O.F.M. † | Bishop of Coimbra, Portugal |
| 32.3 | Appointed | Jacques-Marie-Antoine-Célestin du Pont † | Auxiliary Bishop of Sens (-Auxerre), France | Cardinal, Archbishop of Bourges, France |
| 32.3 | Appointed | Jacques-Marie-Antoine-Célestin du Pont † | Titular Bishop of Samosata | Cardinal, Archbishop of Bourges, France |
| 57.1 | Resigned | Giovanni Francesco Falzacappa † | Bishop of Ancona e Numana, Italy | Cardinal, Prefect of the Apostolic Signatura |
| 38.5 | Confirmed | Charles-Auguste-Marie-Joseph Forbin-Janson † | Bishop of Nancy (-Toul), France |
| 80.0 | Appointed | Bonaventura Gazola, O.F.M. † | Cardinal-Priest of S. Bartolomeo all’Isola | Cardinal, Bishop of Montefiascone, Italy |
| 80.0 | Elevated to Cardinal | Bonaventura Gazola, O.F.M. † | Cardinal, Bishop of Montefiascone, Italy |
| 49.3 | Appointed | Felice Greco † | Bishop of San Marco e Bisignano, Italy |
| 56.4 | Confirmed | Jean-Joseph-Pierre Guigou † | Bishop of Angoulême, France |
| Confirmed | Youssef Habaisci (Hobeish) † | Patriarch of Antiochia {Antioch} (Maronite), Lebanon |
| 64.1 | Appointed | Josef von Hommer † | Bishop of Trier, Germany |
| 44.9 | Appointed | Nicola-Maria Laudisio † | Bishop of Policastro, Italy |
| 42.0 | Appointed | Antonio Monforte † | Bishop of Troia, Italy |
| 66.6 | Appointed | Michele Palmieri † | Bishop of Monopoli, Italy |
| 67.8 | Confirmed | Joseph Chrysostomus Pauer † | Bishop of Sankt Pölten, Austria |
| 58.2 | Appointed | Jean-Paul-Gaston de Pins † | Titular Archbishop of Amasea | Apostolic Administrator Emeritus of Lyon (-Vienne), France |
| 64.7 | Confirmed | Jean-Marie-Dominique de Poulpiquet de Brescanvel † | Bishop of Quimper, France |
| 48.1 | Confirmed | Víctor Damián Sáez y Sánchez Mayor † | Bishop of Tortosa, Spain |
| 71.8 | Confirmed | Emanuel von Schimonski-Schimoni † | Bishop of Wrocław, Poland |
| 66.3 | Appointed | Giuseppe Segna † | Bishop of Marsi, Italy |
| 4 May | | Born | Casimiro Herrero Pérez, O.S.A. † | Villameriel, Spain | Bishop of Nueva Caceres, Philippines |
| 5 May | 81.7 | Died | Mateus de Abreu Pereira † | Bishop of São Paulo, Brazil |
| 9 May | 66.0 | Ordained Bishop | Giovanni Battista de Martino di Pietradoro † | Bishop of Telese o Cerreto Sannita, Italy |
| 85.3 | Died | Jean-Chrysostome de Villaret † | Bishop Emeritus of Casale Monferrato, Italy |
| 11 May | | Appointed | Peter McLaughlin † | Bishop of Derry, Ireland |
| 18 May | 53.3 | Appointed | Roman Sebastian (Franz Xaver) Zängerle, O.S.B. † | Bishop of Seckau, Austria |
| 19 May | 46.8 | Appointed | Ignaz Franz Sales Zimmermann † | Bishop of Lavant, Slovenia |
| 20 May | 60.4 | Appointed | Joaquín López Sicilia † | Bishop of Coria, Spain | Archbishop of Valencia, Spain |
| 47.7 | Appointed | Agustín Lorenzo Varela Temes † | Bishop of Salamanca, Spain |
| 23 May | 69.3 | Ordained Bishop | Giovanni Battista Bussi † | Cardinal, Archbishop of Benevento, Italy |
| 64.8 | Resigned | Ercole Dandini † | Bishop-Elect of Osimo e Cingoli, Italy | Cardinal, Priest of the Roman Curia - Other |
| 58.3 | Appointed | Juan Baltasar Toledano † | Bishop of Valladolid, Spain |
| 24 May | 68.5 | Confirmed | Ramón María Adurriaga Uribe † | Bishop of Avila, Spain |
| 74.1 | Appointed | Timoteo Maria Ascensi, O.C.D. † | Bishop of Rieti, Italy | Bishop of Osimo e Cingoli, Italy |
| 72.7 | Confirmed | François-Marie Bigex † | Archbishop of Chambéry, France |
| Born | Thomas William Croke † | Ballyclough, Ireland | Archbishop of Cashel (-Emly), Ireland |
| 66.1 | Confirmed | Jerónimo Fernandez de Castro Delgado, O.SS.T. † | Bishop of Albarracin, Spain |
| 55.8 | Confirmed | Joseph Maria Johann Nepomuk Freiherr von Fraunberg † | Archbishop of Bamberg, Germany |
| 52.8 | Appointed | Ignacy Giedroyc † | Coadjutor Bishop of Samogizia o Tels (Zmudz), Lithuania |
| 52.8 | Appointed | Ignacy Giedroyc † | Titular Bishop of Casius | Coadjutor Bishop of Samogizia o Tels (Zmudz), Lithuania |
| 50.6 | Appointed | Pietro-Antonio Luciani † | Bishop of Segni, Italy |
| 42.5 | Confirmed | Franz Xavier Luschin † | Bishop of Trento, Italy | Archbishop of Gorizia e Gradisca, Italy |
| 61.6 | Appointed | Filippo Monacelli † | Bishop of Ripatransone, Italy | Bishop of Pesaro, Italy |
| 55.5 | Appointed | Cesare Nembrini Pironi Gonzaga † | Cardinal, Bishop of Ancona e Numana, Italy |
| 46.6 | Appointed | Adalbert Freiherr von Pechmann † | Auxiliary Bishop of Passau, Germany |
| 46.6 | Appointed | Adalbert Freiherr von Pechmann † | Titular Bishop of Canopus | Auxiliary Bishop of Passau, Germany |
| 60.2 | Confirmed | Petrus Pustet † | Bishop of Eichstätt, Germany |
| 54.1 | Confirmed | Pierre-Joseph Rey † | Bishop of Pinerolo, Italy |
| 56.9 | Confirmed | Ignatz Albert (Joseph Ignatz Alexius) von Riegg, O.S.A. † | Bishop of Augsburg, Germany |
| 55.9 | Confirmed | Leonardo Santander Villavicencio † | Bishop of Jaca, Spain | Bishop of Astorga, Spain |
| 47.2 | Appointed | Luigi Ugolini † | Bishop of Fossombrone, Italy |
| 25 May | | Born | Pasquale Maria Jaderosa † | Cervino, Italy | Coadjutor Bishop Emeritus of Sant’Agata de’ Goti, Italy |
| 26 May | | Born | Giuseppe Zaffino † | Corfu | Archbishop of Naxos, Greece |
| 27 May | 74.1 | Ordained Bishop | Timoteo Maria Ascensi, O.C.D. † | Bishop of Rieti, Italy | Bishop of Osimo e Cingoli, Italy |
| 30 May | 65.3 | Appointed | Antonio Ceruelo Sanz † | Bishop of Menorca, Spain |
| 67.1 | Ordained Bishop | Jakob Peregrin Paulitsch † | Bishop of Gurk, Austria |
| 61.7 | Appointed | Simón Antonio Rentería Reyes † | Archbishop of Santiago de Compostela, Spain |
| 46.6 | Appointed | Rafael Manuel José Benito de Vélez Téllez, O.F.M. Cap. † | Archbishop of Burgos, Spain | Archbishop of Santiago de Compostela, Spain |
| 6 Jun | 38.6 | Ordained Bishop | Charles-Auguste-Marie-Joseph Forbin-Janson † | Bishop of Nancy (-Toul), France |
| Born | Isacco Isakowicz † | Lysiec | Archbishop of Lviv (Armenian), Ukraine |
| 7 Jun | 68.0 | Appointed | Bernhard Boll, O. Cist. † | Archbishop of Freiburg im Breisgau, Germany |
| 59.2 | Ordained Bishop | Ignatius Vincentius Matthy † | Bishop of Chelmno (Culma), Poland |
| 55.5 | Ordained Bishop | Cesare Nembrini Pironi Gonzaga † | Cardinal, Bishop of Ancona e Numana, Italy |
| 9 Jun | | Born | Emmanuele Antonio Palacios † | Luque | Bishop of Paraguay |
| 11 Jun | | Born | Manuel Gómez-Salazar y Lucio-Villegas † | Arijas | Archbishop of Burgos, Spain |
| 12 Jun | | Born | Louis-Simon Faurie, M.E.P. † | Monségur, France | Vicar Apostolic of Kuiceu, China |
| 23.7 | Ordained Priest | St. Giustino Sebastiano Pasquale de Jacobis, C.M. † | Priest of Congregation of the Mission | Vicar Apostolic of Abyssinia, Ethiopia |
| 13 Jun | 68.0 | Installed | Joseph Chrysostomus Pauer † | Bishop of Sankt Pölten, Austria |
| 64.9 | Ordained Bishop | Jean-Marie-Dominique de Poulpiquet de Brescanvel † | Bishop of Quimper, France |
| 16 Jun | | Born | Federico Mascaretti, O. Carm. † | Pianello Val Tidone | Bishop Emeritus of Susa, Italy |
| Born | Antonio Morana † | Modica | Bishop of Caltagirone, Italy |
| 17 Jun | 49.6 | Incardinated | Ignaz Heinrich von Wessenberg † | Priest of Freiburg im Breisgau, Germany | Vicar Apostolic Emeritus of Konstanz {Constance}, Germany |
| 49.6 | Resigned | Ignaz Heinrich von Wessenberg † | Vicar Apostolic of Konstanz {Constance}, Germany | Vicar Apostolic Emeritus |
| 18 Jun | | Born | Joseph-André Boyer, M.E.P. † | Aix-en-Provence, France | Coadjutor Vicar Apostolic of Manchuria {Manciuria}, China |
| 19 Jun | | Born | François-Marie Trégaro † | Peillac | Bishop of Sées, France |
| 21 Jun | 75.5 | Died | Louis-François de Bausset-Roquefort † | Cardinal, Bishop Emeritus of Alès (Alais), France |
| Born | Victor-Jean-François-Paulin Delannoy † | Templeuwe | Bishop of Aire et Dax, France |
| 23 Jun | | Died | Zenobius Benucci, O. Carm. † | Vicar Apostolic of Tibet-Hindustan, India |
| Born | Johann Baptist Zwerger † | Alrei, Italy | Bishop of Seckau, Austria |
| 24 Jun | 54.5 | Appointed | Luis Antonio Folgueras Sión † | Bishop of San Cristóbal de La Laguna o Tenerife, Spain | Archbishop of Granada, Spain |
| 47.8 | Appointed | Manuel Bernardo Morete Bodelón † | Bishop of Islas Canarias {Canary Islands}, Spain | Bishop of Astorga, Spain |
| 27 Jun | 46.1 | Appointed | Joaquín Abarca Blanque † | Bishop of León, Spain |
| 52.6 | Appointed | Félix Herrero Valverde † | Bishop of Orihuela, Spain |
| 29 Jun | 56.1 | Ordained Bishop | Pierre-Marie Cottret † | Titular Bishop of Carystus | Bishop of Beauvais, France |
| 32.4 | Ordained Bishop | Jacques-Marie-Antoine-Célestin du Pont † | Titular Bishop of Samosata | Cardinal, Archbishop of Bourges, France |
| 56.6 | Ordained Bishop | Jean-Joseph-Pierre Guigou † | Bishop of Angoulême, France |
| 59.5 | Appointed | Pedro Inguanzo Rivero † | Cardinal, Archbishop of Toledo, Spain |
| 52.3 | Ordained Bishop | Thomas Penswick † | Titular Bishop of Europus | Vicar Apostolic of Northern District, England, Great Britain |
| 6 Jul | | Born | Jean-Baptiste-Théodore Duval † | Le Havre | Bishop of Soissons (-Laon), France |
| 8 Jul | 79.8 | Died | Manuel Cayetano Muñoz Benavente † | Auxiliary Bishop Emeritus of Sevilla {Seville}, Spain |
| 52.8 | Appointed | Mariano Rodríguez de Olmedo y Valle † | Archbishop of Santiago de Cuba |
| 11 Jul | 57.0 | Ordained Bishop | Ignatz Albert (Joseph Ignatz Alexius) von Riegg, O.S.A. † | Bishop of Augsburg, Germany |
| 12 Jul | 58.2 | Appointed | Vincenzo-Maria Armentano, O.P. † | Bishop of Mileto, Italy |
| 56.9 | Appointed | Gaetano Buglieni † | Bishop of Mondovi, Italy |
| 65.4 | Confirmed | Antonio Ceruelo Sanz † | Bishop of Menorca, Spain |
| 64.4 | Appointed | Lodovico de Gallo, O.F.M. Cap. † | Archbishop of Santa Severina, Italy |
| 63.3 | Confirmed | Jean-Baptist-Marie-Anne-Antoine de Latil † | Cardinal, Archbishop of Reims, France |
| 60.5 | Confirmed | Joaquín López Sicilia † | Bishop of Coria, Spain | Archbishop of Valencia, Spain |
| 46.8 | Appointed | Giuseppe Mancini † | Archbishop of Siena, Italy |
| 55.3 | Confirmed | Claude-Hippolyte Clausel de Montals † | Bishop of Chartres, France | Bishop Emeritus |
| 45.3 | Appointed | Giacinto Pippi † | Bishop of Chiusi-Pienza, Italy |
| 42.0 | Appointed | Luigi Pochettini † | Bishop of Ivrea, Italy |
| 61.8 | Confirmed | Simón Antonio Rentería Reyes † | Archbishop of Santiago de Compostela, Spain |
| 46.7 | Confirmed | Rafael Manuel José Benito de Vélez Téllez, O.F.M. Cap. † | Archbishop of Burgos, Spain | Archbishop of Santiago de Compostela, Spain |
| 58.5 | Confirmed | Juan Baltasar Toledano † | Bishop of Valladolid, Spain |
| 47.8 | Confirmed | Agustín Lorenzo Varela Temes † | Bishop of Salamanca, Spain |
| 42.1 | Appointed | Antonio Luigi Wolf † | Bishop of Ljubljana, Slovenia |
| 18 Jul | 72.0 | Resigned | Juan García Benito † | Archbishop of Santiago de Compostela, Spain | Archbishop Emeritus |
| 21 Jul | 75.6 | Died | Charles-César-Louis d'Agoult de Bonneval † | Bishop Emeritus of Pamiers, France |
| 22 Jul | 40.8 | Appointed | Francisco Javier García Casarrubios y Melgar, O. Cist. † | Bishop of Ceuta, Spain | Bishop of Tui, Spain |
| 24 Jul | 23.1 | Ordained Priest | Jean-Paul-François-Marie-Félix Lyonnet † | Priest | Archbishop of Albi, France |
| 25 Jul | 60.4 | Ordained Bishop | Juan José Cordón Leyva † | Bishop of Guadix, Spain |
| Ordained Bishop | Cornelius Egan † | Coadjutor Bishop of Kerry (o Ardfert) e Aghadoe, Ireland | Bishop |
| 66.3 | Ordained Bishop | Jerónimo Fernandez de Castro Delgado, O.SS.T. † | Bishop of Albarracin, Spain |
| 46.8 | Ordained Bishop | Adalbert Freiherr von Pechmann † | Titular Bishop of Canopus | Auxiliary Bishop of Passau, Germany |
| 1 Aug | 54.3 | Ordained Bishop | Pierre-Joseph Rey † | Bishop of Pinerolo, Italy |
| 9 Aug | | Born | Girolamo Volpe † | Napoli | Bishop of Alife, Italy |
| 10 Aug | 26.7 | Ordained Priest | Antonio Maria Cagiano de Azevedo † | Priest | Cardinal, Prefect Emeritus of the Congregation of the Council |
| 21 Aug | | Born | Osvaldo Casali † | Camerino | Titular Bishop of Miletus |
| 22 Aug | 55.4 | Ordained Bishop | Claude-Hippolyte Clausel de Montals † | Bishop of Chartres, France | Bishop Emeritus |
| 23 Aug | 50.4 | Appointed | Bernardo Francés Caballero † | Archbishop of Zaragoza, Spain |
| 24 Aug | 62.4 | Ordained Bishop | Richard Kornelius Dammers † | Titular Bishop of Tiberias | Bishop of Paderborn, Germany |
| Appointed | Edmond French, O.P. † | Bishop of Kilmacduagh, Ireland |
| 64.4 | Ordained Bishop | Josef von Hommer † | Bishop of Trier, Germany |
| 25 Aug | | Born | Gaetano Caporali, C.Pp.S. † | Castelfrentano | Archbishop of Otranto, Italy |
| 26 Aug | 72.1 | Installed | Emanuel von Schimonski-Schimoni † | Bishop of Wrocław, Poland |
| 27 Aug | 66.8 | Appointed | Juan Francisco Martínez Castrillón † | Bishop of Palencia, Spain | Bishop of Málaga, Spain |
| 28 Aug | | Born | Imrich Bende † | Baja, Hungary | Bishop of Nitra, Slovakia |
| 29 Aug | 48.4 | Ordained Bishop | Víctor Damián Sáez y Sánchez Mayor † | Bishop of Tortosa, Spain |