| Date | Age | Event | Bishop | Title | Current Title |
| 1 May | 64.1 | Died | Lorenzo Litta † | Cardinal, Prefect of the Congregation for Residence of Bishops |
| 2 May | 50.0 | Appointed | Pierre-Alexandre Coupperie, S.M.M. † | Bishop of Baghdad, Iraq |
| 6 May | 49.5 | Appointed | Pietro Francesco Galleffi † | Archpriest of the Basilica di San Pietro in Vaticano {Saint Peter Basilica} | Cardinal, Cardinal-Bishop of Porto e Santa Rufina |
| 61.3 | Appointed | Emmanuele de Gregorio † | Prefect of the Congregation of the Council | Cardinal, Major Penitentiary of the Apostolic Penitentiary |
| Born | Nicola de Simone † | | Bishop of Bova, Italy |
| 7 May | 64.3 | Ordained Bishop | Joaquim José de Miranda Coutinho † | Bishop of Castelo Branco, Portugal |
| 9 May | 59.7 | Appointed | Annibale Francesco Clemente Melchiore Girolamo Nicola della Genga † | Prefect of the Congregation of Ecclesiastical Immunity | Pope (Roma {Rome}, Italy) |
| 71.8 | Resigned | Giulio Gabrielli † | Prefect of the Congregation of the Council | Cardinal, Prefect Emeritus |
| 10 May | 86.6 | Appointed | Giovanni Battista Quarantotti † | Prefect of the Apostolic Signatura | Cardinal, Prefect of the Congregation for Propagation of the Faith |
| 13 May | 66.3 | Died | Marco Negri † | Bishop of Sapë, Albania |
| 17 May | | Born | Clément Mikaelian † | | Bishop of Marasc (Armenian), Turkey |
| 18 May | | Born | Ioan Vancea (Vancsa) † | | Archbishop of Făgăraş şi Alba Iulia (Romanian), Romania |
| 20 May | 77.6 | Resigned | José Joaquim da Cunha Azevedo Coutinho † | Bishop of Elvas, Portugal | Bishop Emeritus |
| 21 May | 39.8 | Ordained Bishop | Giacomo Luigi Fontana, M.E.P. † | Titular Bishop of Sinitis | Vicar Apostolic of Houkouang, China |
| 34.6 | Ordained Bishop | Nicolň Gatto † | Titular Bishop of Titiopolis | Bishop of Patti, Italy |
| 23 May | 47.5 | Selected | Ján Krstitel Ladislav Pyrker (Pryker), O. Cist. † | Patriarch of Venezia {Venice}, Italy | Archbishop of Eger, Hungary |
| 27 May | 23.5 | Ordained Deacon | Karl Arnold-Obrist † | Deacon of Basel, Switzerland | Bishop |
| 30.3 | Ordained Priest | Patrick Durcan † | Priest | Bishop of Achonry, Ireland |
| 24.4 | Ordained Priest | François-Nicholas-Madeleine Morlot † | Priest | Cardinal, Archbishop of Paris, France |
| 28 May | 73.5 | Died | Bernardo Maria della Torre † | Bishop of Castellammare di Stabia, Italy |
| Born | Emmanuele Kaubeck † | | Bishop of Adria, Italy |
| Born | William Lanigan † | | Bishop of Goulburn, Australia |
| 29 May | 58.4 | Confirmed | Manuel Nicolau de Almeida, O.C.D. † | Bishop of Angra, Portugal |
| 63.4 | Appointed | Tommaso Maria Raimondo Leopoldo Arezzo † | Cardinal, Cardinal-Bishop of Sabina |
| 64.7 | Appointed | Cesare Brancadoro † | Cardinal-Priest of Sant’Agostino | Cardinal, Archbishop of Fermo, Italy |
| 59.9 | Appointed | Santiago Creus y Martí † | Archbishop of Tarragona, Spain |
| 67.0 | Appointed | Ignacy Stanislaw Czyżewski † | Bishop of Sejny o Sejna o Augustów, Poland |
| 47.6 | Confirmed | Paul-Thérčse-David d’Astros † | Bishop of Bayonne, France | Cardinal, Archbishop of Toulouse (-Narbonne), France |
| 75.8 | Appointed | Giulio Maria della Somaglia † | Cardinal-Bishop of Ostia (e Velletri) | Cardinal, Librarian of the Vatican Library |
| 73.3 | Appointed | Michele Di Pietro † | Cardinal-Bishop of Porto e Santa Rufina | Cardinal, Major Penitentiary of the Apostolic Penitentiary |
| 65.7 | Confirmed | Jean-Baptiste Dubois † | Bishop of Dijon, France |
| 55.3 | Appointed | Francisco Ferreira de Azevedo † | Prelate of Goiás, Brazil | Bishop of Goiás, Brazil |
| 55.3 | Appointed | Francisco Ferreira de Azevedo † | Titular Bishop of Castoria | Bishop of Goiás, Brazil |
| 49.5 | Appointed | Pietro Francesco Galleffi † | Cardinal-Bishop of Albano | Cardinal, Cardinal-Bishop of Porto e Santa Rufina |
| 72.9 | Appointed | Viktor Franz Anton von Glutz-Ruchti † | Coadjutor Bishop of Basel, Switzerland |
| 72.9 | Appointed | Viktor Franz Anton von Glutz-Ruchti † | Titular Bishop of Chersonesus in Creta | Coadjutor Bishop of Basel, Switzerland |
| 56.6 | Appointed | Francisco Alexandre Lobo, O.S.B. † | Bishop of Viseu, Portugal |
| 66.9 | Died | Jean de Longueville † | Prefect Emeritus of Iles Saint-Pierre et Miquelon |
| 54.6 | Appointed | Joaquim de Meneses e Ataide, O.E.S.A. † | Bishop of Elvas, Portugal |
| 69.5 | Confirmed | Louis-Siffrein-Joseph de Salamon † | Bishop of Saint-Flour, France |
| 44.7 | Appointed | Annibale Tommasi † | Bishop of Sansepolcro (Borgo San Sepolcro), Italy |
| 1 Jun | | Born | Domenico Pietromarchi † | | Bishop of Anagni, Italy |
| 2 Jun | 62.9 | Selected | Giambattista Castelnuovo † | Bishop of Como, Italy |
| Born | John Farrell † | | Bishop of Hamilton, Ontario, Canada |
| 64.4 | Selected | Pietro Mola † | Bishop of Bergamo, Italy |
| 54.3 | Selected | Carlo Pio Ravasi, O.S.B. † | Bishop of Adria, Italy |
| 4 Jun | 47.0 | Ordained Bishop | Józef Szczepan Koźmian † | Titular Bishop of Carystus | Bishop of Włocławek (Kujawy, Kalisze), Poland |
| 5 Jun | 20.1 | Professed | Dalmazio (Pietro) d’Andrea, O.F.M. Cap. † | Member of Order of Friars Minor Capuchin | Bishop of Bova, Italy |
| 8 Jun | 67.2 | Selected | Gregório José Viegas, T.O.R. † | Bishop of Olinda, Brazil | Former Bishop-Elect |
| 11 Jun | 44.7 | Ordained Bishop | Annibale Tommasi † | Bishop of Sansepolcro (Borgo San Sepolcro), Italy |
| 18 Jun | 79.6 | Died | [Jean-Baptiste Blampoix] † | Bishop Emeritus of [Aube (Constitutional), France] |
| 24 Jun | 53.0 | Selected | Giuseppe Vincenzo Airenti, O.P. † | Bishop of Savona, Italy | Archbishop of Genova, Italy |
| 45.6 | Selected | Carmelo Cordiviola † | Bishop of Albenga, Italy |
| 31.2 | Selected | Luigi Fransoni † | Bishop of Fossano, Italy | Archbishop of Torino {Turin}, Italy |
| 66.6 | Selected | Felice Levreri (Levrieri) † | Bishop of Ventimiglia, Italy |
| Born | Johann Baptist Nogáll † | | Auxiliary Bishop of Oradea Mare {Gran Varadino, Nagyvárad}, Romania |
| 64.7 | Selected | Pietro Luigi Scarabelli, C.M. † | Bishop of Luni, Sarzana e Brugnato, Italy | Bishop Emeritus |
| 26 Jun | | Born | Pedro Juan Aponte † | | Bishop of Paraguay (o Ssma Assunzione) |
| 28 Jun | | Born | Paolo Beriscia † | | Bishop of Pult (Pulati), Albania |
| 29 Jun | | Born | Pavao Gugler † | | Auxiliary Bishop of Zagreb, Croatia |
| 90.1 | Died | Sigismund Anton von Hohenwart, S.J. † | Archbishop of Wien {Vienna}, Austria |
| 1 Jul | 71.5 | Selected | Anne-Antoine-Jules de Clermont-Tonnerre † | Archbishop of Toulouse, France | Cardinal, Archbishop of Toulouse (-Narbonne), France |
| 66.3 | Selected | Jean-Marie Cliquet de Fontenay † | Archbishop of Bourges, France |
| 2 Jul | 53.5 | Ordained Bishop | Abraham Kandilian (Candil) † | Titular Bishop of Doliche | Archbishop of Mardin (Armenian), Turkey |
| 3 Jul | 50.6 | Selected | Francesco Colangelo, C.O. † | Bishop of Castellammare di Stabia, Italy |
| 6 Jul | | Born | Giovanni Maria Berengo † | | Archbishop of Udine, Italy |
| 7 Jul | | Born | Alexandre-Léopold Sebaux † | | Bishop of Angoulęme, France |
| Born | Antonio Vincenzo Testa, O.F.M. Obs. † | | Bishop of Segni, Italy |
| 8 Jul | 50.4 | Selected | Guillaume-Aubin de Villčle † | Bishop of Soissons, France | Archbishop of Bourges, France |
| 9 Jul | 47.7 | Ordained Bishop | Paul-Thérčse-David d’Astros † | Bishop of Bayonne, France | Cardinal, Archbishop of Toulouse (-Narbonne), France |
| 65.8 | Ordained Bishop | Jean-Baptiste Dubois † | Bishop of Dijon, France |
| 52.7 | Ordained Bishop | José Calixto Orihuela Valderrama, O.E.S.A. † | Titular Bishop of Calama | Bishop Emeritus of Cuzco, Peru |
| 11 Jul | 41.2 | Appointed | Patrick Kelly † | Bishop of Richmond, Virginia, USA | Bishop of Waterford and Lismore, Ireland |
| 35.5 | Appointed | Patrick McGettigan † | Bishop of Raphoe, Ireland |
| 12 Jul | 82.5 | Died | Louis-Charles de Machault † | Bishop Emeritus of Amiens, France |
| 14 Jul | 42.5 | Appointed | Pierre de Glory † | Vicar Apostolic | Titular Bishop of Macri |
| 42.5 | Appointed | Pierre de Glory † | Titular Bishop of Macri |
| 15 Jul | 80.5 | Died | Luigi Maria Pirelli, C.R. † | Archbishop of Trani e Bisceglie, Italy |
| 16 Jul | 42.5 | Ordained Bishop | Pierre de Glory † | Titular Bishop of Macri |
| 56.7 | Ordained Bishop | Francisco Alexandre Lobo, O.S.B. † | Bishop of Viseu, Portugal |
| 65.4 | Ordained Bishop | Kajetan Augustyn Warteresiewicz † | Archbishop of Lviv (Armenian), Ukraine |
| 18 Jul | 61.7 | Installed | Bernardino D’Avolio, O.F.M. Cap. † | Bishop of Trivento, Italy |
| 69.7 | Installed | Louis-Siffrein-Joseph de Salamon † | Bishop of Saint-Flour, France |
| 19 Jul | | Born | Louis-Romain-Ernest Isoard † | | Bishop of Annecy, France |
| 22 Jul | 64.4 | Died | Baldassare Leone † | Bishop of Agrigento (Girgenti), Italy |
| 25 Jul | 80.9 | Died | Girolamo Pavesi † | Bishop of Pontremoli, Italy |
| 26 Jul | 62.9 | Died | Joăo Joaquim Bernardino de Brito † | Bishop of Funchal, Portugal |
| 43.7 | Installed | Manuel Isidoro Pérez Sánchez (Súarez) † | Bishop of Antequera, Oaxaca, México | Bishop Emeritus |
| 27 Jul | | Born | Ludovico Marangoni, O.F.M. Conv. † | | Bishop of Chioggia, Italy |
| 29 Jul | 75.6 | Died | Salvatore Maria Caccamo, O.E.S.A. † | Titular Archbishop of Larissa in Thessalia |
| 30 Jul | 23.6 | Ordained Priest | Domenico Lucciardi † | Priest | Cardinal, Bishop of Senigallia, Italy |
| Aug | 26.1 | Professed | Jean-Louis Taberd, M.E.P. † | Priest of La Société des Missions Etrangčres | Vicar Apostolic of Cochin {Cocincina}, Viet Nam |
| 3 Aug | 22.1 | Ordained Deacon | Jan Valerián Jirsík † | Deacon | Bishop of České Budĕjovice {Budweis}, Czechia |
| 6 Aug | 67.2 | Ordained Bishop | Ignacy Stanislaw Czyżewski † | Bishop of Sejny o Sejna o Augustów, Poland |
| 11 Aug | 33.9 | Appointed | John England † | Bishop of Charleston, South Carolina, USA |
| 12 Aug | | Born | Franz Adolf Namszanowski † | | Vicar Apostolic Emeritus of Germany, Military |
| 14 Aug | 26.8 | Ordained Priest | Michelangelo Orlandi † | Priest | Bishop of Pontremoli, Italy |
| 21 Aug | | Born | Giuseppe Boraggini † | | Bishop of Savona e Noli, Italy |
| 23 Aug | | Born | Louis-Désiré-César Bataille † | | Bishop of Amiens, France |
| 24 Aug | 41.3 | Ordained Bishop | Patrick Kelly † | Bishop of Richmond, Virginia, USA | Bishop of Waterford and Lismore, Ireland |
| 26 Aug | 24.7 | Ordained Priest | François Lacroix † | Priest of Paris, France | Bishop of Bayonne, France |
| 27 Aug | 73.2 | Ordained Bishop | Viktor Franz Anton von Glutz-Ruchti † | Titular Bishop of Chersonesus in Creta | Coadjutor Bishop of Basel, Switzerland |
| 28 Aug | 62.2 | Appointed | Luís da Cunha de Abreu e Melo † | Bishop of Beja, Portugal |
| 63.9 | Appointed | János Benyovszky † | Auxiliary Bishop of Esztergom, Hungary |
| 63.9 | Appointed | János Benyovszky † | Titular Bishop of Lystra | Auxiliary Bishop of Esztergom, Hungary |
| 55.8 | Appointed | Francesco Canali † | Bishop of Tivoli, Italy | Cardinal, Bishop Emeritus |
| 71.6 | Confirmed | Anne-Antoine-Jules de Clermont-Tonnerre † | Archbishop of Toulouse, France | Cardinal, Archbishop of Toulouse (-Narbonne), France |
| 66.4 | Confirmed | Jean-Marie Cliquet de Fontenay † | Archbishop of Bourges, France |
| 64.5 | Appointed | Ferdinand Hermann Maria von Lüninck † | Bishop of Münster, Germany |
| 57.4 | Appointed | Vicente da Soledade e Castro, O.S.B. † | Archbishop of Săo Salvador da Bahia, Brazil |
| 58.5 | Appointed | Romualdo de Souza Coelho † | Bishop of Belém do Pará, Brazil |
| 52.1 | Appointed | Peter de Ürményi † | Auxiliary Bishop of Esztergom, Hungary |
| 52.1 | Appointed | Peter de Ürményi † | Titular Bishop of Corycus | Auxiliary Bishop of Esztergom, Hungary |
| 50.5 | Confirmed | Guillaume-Aubin de Villčle † | Bishop of Soissons, France | Archbishop of Bourges, France |
| 29 Aug | 41.0 | Appointed | Zenobio Maria Benucci, O.F.M. Cap. † | Vicar Apostolic of Tibet-Hindustan, India |
| 41.0 | Appointed | Zenobio Maria Benucci, O.F.M. Cap. † | Titular Bishop of Thermae Basilicae | Vicar Apostolic of Tibet-Hindustan, India |
| 31 Aug | 58.6 | Ordained Bishop | Manuel Nicolau de Almeida, O.C.D. † | Bishop of Angra, Portugal |