| Date | Age | Event | Bishop | Title | Current Title |
| 1 May | 36.8 | Ordained Bishop | Peter Augustine Baines, O.S.B. † | Titular Bishop of Sigus | Vicar Apostolic of Western District, England, Great Britain |
| 73.4 | Ordained Bishop | Jean Brumault de Beauregard † | Bishop of Orléans, France | Bishop Emeritus |
| 64.0 | Ordained Bishop | Claude-Joseph-Judith-François-Xavier de Sagey † | Bishop of Tulle, France | Bishop Emeritus |
| 2 May | 77.3 | Died | Gabriel Cortois de Pressigny † | Archbishop of Besançon, France |
| 68.8 | Succeeded | Paul-Ambroise Frère de Villefrancon † | Archbishop of Besançon, France |
| 3 May | 55.2 | Confirmed | Jean-Louis Anne Madelain Lefebvre de Cheverus † | Bishop of Montauban, France | Cardinal, Archbishop of Bordeaux, France |
| 4 May | 23.4 | Ordained Deacon | Joseph Crétin † | Deacon of Belley, France | Bishop of Saint Paul, Minnesota, USA |
| 76.6 | Ordained Bishop | Charles-François Duperrier-Dumourier † | Bishop of Bayeux, France |
| 23.1 | Ordained Priest | Jean-Marie (John Mary) Odin, C.M. † | Priest of Congregation of the Mission | Archbishop of New Orleans, Louisiana, USA |
| 8 May | | Born | Miguel Moisés Aráoz † | | Auxiliary Bishop of Salta, Argentina |
| Born | Vincenzo Capelli † | | Bishop of Tortona, Italy |
| Born | Domenico de Angelis † | | Titular Bishop of Hippos |
| 71.7 | Died | Viviano Orfini † | Cardinal, Priest of the Roman Curia - Other |
| 9 May | 66.7 | Died | Pietro Paolo Mazzichi † | Bishop of Montalto (delle Marche), Italy |
| 11 May | 55.0 | Succeeded | Daniel Murray † | Archbishop of Dublin, Ireland |
| 84.1 | Died | John Thomas Troy, O.P. † | Archbishop of Dublin, Ireland |
| 12 May | | Died | Yuhanna El-Helou (Dolce) † | Patriarch of Antiochia {Antioch} (Maronite), Lebanon |
| 63.4 | Died | Gaspard-Jean-André Jauffret † | Bishop of Metz, France |
| 13 May | | Born | Achille Apolloni † | | Cardinal, Cardinal-Deacon of San Cesareo in Palatio |
| 16 May | 54.9 | Confirmed | François-Antoine Arbaud † | Bishop of Gap, France |
| 69.0 | Appointed | Francesco Bertazzoli † | Cardinal-Priest of Santa Maria sopra Minerva | Cardinal, Prefect of the Congregation for Studies |
| 51.3 | Appointed | Giuseppe Maria Bozzi † | Bishop of Mantova, Italy |
| 55.8 | Confirmed | Antoine-Jacques de Chamon † | Bishop of Saint-Claude, France |
| 63.8 | Appointed | Ercole Dandini † | Cardinal-Priest of Santa Balbina | Cardinal, Prefect of the Roman Curia - Other |
| 44.3 | Confirmed | Etienne-Bruno-Marie d’Arbou † | Bishop of Verdun, France | Bishop Emeritus of Bayonne, France |
| 56.1 | Appointed | Giovanni Francesco Falzacappa † | Cardinal-Priest of Santi Nereo ed Achilleo | Cardinal, Prefect of the Apostolic Signatura |
| 69.6 | Appointed | Filippo Filonardi † | Titular Archbishop of Athenae | Archbishop of Ferrara, Italy |
| 71.6 | Appointed | Antonio Maria Frosini † | Cardinal-Deacon of Santa Maria in Cosmedin | Cardinal, Prefect of the Congregation for Indulgences and Relics |
| 70.6 | Elevated to Cardinal | Anne-Louis-Henri de La Fare † | Cardinal, Archbishop of Sens (-Auxerre), France |
| 53.2 | Confirmed | Claude-Louis de Lesquen † | Bishop of Beauvais, France | Bishop Emeritus of Rennes, France |
| 64.1 | Confirmed | Antoine de Pons de La Grange † | Bishop of Moulins, France |
| 68.5 | Confirmed | Jean-François-Marie Le Pappe de Trévern † | Bishop of Aire, France | Bishop of Strasbourg, France |
| 63.3 | Confirmed | Louis-Charles-François de La Tour-Landorte † | Bishop of Pamiers, France |
| 74.0 | Confirmed | Fortuné-Charles de Mazenod † | Bishop of Marseille, France | Bishop Emeritus |
| 46.0 | Confirmed | Vincenz Eduard Milde † | Bishop of Litoměřice, Czechia | Archbishop of Wien {Vienna}, Austria |
| 66.4 | Confirmed | Jean-Baptiste-François-Nicolas Millaux † | Bishop of Nevers, France |
| 64.3 | Confirmed | André Molin † | Bishop of Viviers, France |
| 46.8 | Confirmed | Jacopo Monico † | Bishop of Ceneda, Italy | Cardinal, Patriarch of Venezia {Venice}, Italy |
| 69.5 | Confirmed | André-Etienne-Antoine de Morlhon † | Archbishop of Auch, France |
| 51.3 | Appointed | Giovanni Alessandro Muzi † | Titular Archbishop of Philippi | Bishop of Città di Castello, Italy |
| 65.4 | Confirmed | Antoine-Xavier de Neirac † | Bishop of Tarbes, France |
| 38.1 | Appointed | Carlo Odescalchi, S.J. † | Cardinal-Priest of Santi XII Apostoli | Priest of Society of Jesus |
| 53.2 | Appointed | Antonio Pallotta † | Cardinal-Priest of San Silvestro in Capite | Cardinal, Prefect of the Apostolic Signatura |
| 71.6 | Appointed | Luigi Pandolfi † | Cardinal, Cardinal-Priest of Santa Sabina |
| 53.5 | Appointed | Carlo Maria Pedicini † | Cardinal-Priest of Santa Maria in Via | Cardinal, Cardinal-Bishop of Porto e Santa Rufina |
| 63.4 | Appointed | Giuseppe Perugini, O.E.S.A. † | Titular Bishop of Porphyreon |
| 49.6 | Appointed | Giuseppe della Porta Rodiani † | Titular Patriarch of Constantinople | Cardinal, Auxiliary Bishop of Roma {Rome}, Italy |
| 63.7 | Confirmed | Charles-Alexandre de Richery † | Bishop of Fréjus, France | Archbishop of Aix (-Arles-Embrun), France |
| 67.2 | Confirmed | Philippe-François Sausin † | Bishop of Blois, France |
| 67.5 | Appointed | Francesco Serlupi † | Cardinal, Cardinal-Priest of Santa Prassede |
| 59.8 | Confirmed | Luigi Tosi † | Bishop of Pavia, Italy |
| 54.1 | Elevated to Cardinal | Giacinto Placido Zurla, O.S.B. † | Cardinal, Prefect of the Congregation for Studies |
| 18 May | 51.3 | Ordained Bishop | Giuseppe Maria Bozzi † | Bishop of Mantova, Italy |
| 63.4 | Ordained Bishop | Giuseppe Perugini, O.E.S.A. † | Titular Bishop of Porphyreon |
| 59.8 | Ordained Bishop | Luigi Tosi † | Bishop of Pavia, Italy |
| 20 May | 25.5 | Ordained Deacon | James Sharples † | Deacon of Northern District, England, Great Britain | Coadjutor Vicar Apostolic of Lancashire District, England, Great Britain |
| 23 May | | Born | Joaquín Guillermo González Gutiérrez † | | Bishop Emeritus of Antioquía, Colombia |
| 24 May | 24.2 | Ordained Priest | Guy-Louis-Jean-Marie Alouvry † | Priest | Bishop Emeritus of Pamiers, France |
| 21.2 | Ordained Priest | William Clancy † | Priest | Vicar Apostolic Emeritus of British Guiana, Guyana, Antilles |
| 22.7 | Ordained Priest | François-Augustin Delamare † | Priest | Archbishop of Auch, France |
| 22.5 | Ordained Priest | Dominique Galvano † | Priest | Bishop of Nice, France |
| Born | Patrick Moran † | | Bishop of Dunedin, New Zealand |
| 22.9 | Ordained Priest | Luigi Moreno † | Priest of Alba (Pompea), Italy | Bishop of Ivrea, Italy |
| 25 May | 36.0 | Selected | Youssef Boutros Hobaish (Habaisci) † | Patriarch of Antiochia {Antioch} (Maronite), Lebanon |
| 51.3 | Ordained Bishop | Giovanni Alessandro Muzi † | Titular Archbishop of Philippi | Bishop of Città di Castello, Italy |
| 38.2 | Ordained Bishop | Carlo Odescalchi, S.J. † | Archbishop of Ferrara, Italy | Priest of Society of Jesus |
| Born | Juan Nepomuceno Rueda Rueda † | | Bishop Emeritus of Antioquía, Colombia |
| 29 May | | Died | Basilios Haractengi (Araqtingi), B.C. † | Bishop of Alep [Beroea, Halab] (Melkite Greek), Syria |
| 30 May | 47.6 | Selected | Marie-Joseph-François-Victor Monyer de Prilly † | Bishop of Châlons, France |
| 31 May | 65.0 | Died | Andrés García Palomares † | Bishop of Albarracin, Spain |
| 1 Jun | 69.7 | Ordained Bishop | Filippo Filonardi † | Titular Archbishop of Athenae | Archbishop of Ferrara, Italy |
| 25.4 | Ordained Priest | Bernard Donald McDonald † | Priest of Québec, Canada | Bishop of Charlottetown, Prince Edward Island, Canada |
| 4 Jun | | Born | Aleksander Kazimierz Bereśniewicz † | | Bishop Emeritus of Włocławek (Kujawy, Kalisze), Poland |
| 8 Jun | 23.2 | Ordained Deacon | Matthias Majercsak † | Deacon | Auxiliary Bishop of Włocławek (Kujawy, Kalisze), Poland |
| Born | James Whelan, O.P. † | | Bishop Emeritus of Nashville, Tennessee, USA |
| 10 Jun | | Born | Antonio Piterà † | | Bishop Emeritus of Bova, Italy |
| 73.3 | Died | Johann Nepomuk von Dankesreither † | Bishop of Sankt Pölten, Austria |
| 12 Jun | 58.4 | Selected | Jean-François de Saunhac-Belcastel † | Bishop of Perpignan-Elne, France |
| Born | Theophiel (Théophile) Verbist, C.I.C.M. † | | Pro-Vicar Apostolic of Mongolia, China |
| 15 Jun | 56.3 | Ordained Bishop | Alexandre-Raymond Devie † | Bishop of Belley, France |
| 23.0 | Ordained Priest | Giosuè Maria Saggese, C.Ss.R. † | Priest of Congregation of the Most Holy Redeemer | Archbishop of Chieti, Italy |
| Born | Camillo Santori † | | Bishop Emeritus of Fano, Italy |
| 18 Jun | 62.4 | Died | Jean-Jacques Guérard, M.E.P. † | Coadjutor Vicar Apostolic of Western Tonking {Tonkino Occidentale}, Viet Nam |
| 20 Jun | 45.3 | Selected | Michele Basilio Clari (Clary), O.S.B.I. † | Archbishop of Bari (-Canosa), Italy |
| 65.4 | Selected | Nicola Coppola, C.O. † | Archbishop (Personal Title) of Nola, Italy | Bishop |
| 63.5 | Selected | Francesco Saverio Durini, O.S.B. † | Bishop of Aversa, Italy |
| 59.6 | Selected | Giuseppe Maria Pezzella, O.E.S.A. † | Bishop of Teramo, Italy | Bishop of Calvi e Teano, Italy |
| 78.2 | Selected | Salvatore Maria Pignattaro, O.P. † | Archbishop (Personal Title) of Isernia, Italy | Bishop |
| 22 Jun | 22.0 | Ordained Deacon | Ruggero Blundo, O.S.B. † | Deacon of Order of Saint Benedict | Bishop of Cefalù, Italy |
| Ordained Bishop | Giovanni Antonio Conio (di Pompeiana), O.F.M. Obs. † | Titular Bishop of Echinus | Coadjutor Vicar Apostolic of Hukwang, Shansi [Shanxi], and Shensi [Shaanxi], China |
| 25 Jun | 57.5 | Selected | Stanislao Mossa † | Bishop of Ampurias e Civita, Italy |
| 28 Jun | 71.9 | Died | Pierre-Vincent Dombideau de Crouseilhes † | Bishop of Quimper, France |
| Born | Pietro Facciotti † | | Bishop Emeritus of Ferentino, Italy |
| 29 Jun | 60.2 | Ordained Bishop | James Yorke Bramston † | Titular Bishop of Usula | Vicar Apostolic of London District, England, Great Britain |
| 23.7 | Ordained Priest | Francesco Saverio d’Ambrosio, O.F.M. Cap. † | Priest of Order of Friars Minor Capuchin | Bishop of Muro Lucano, Italy |
| 23.3 | Ordained Priest | Matthias Majercsak † | Priest | Auxiliary Bishop of Włocławek (Kujawy, Kalisze), Poland |
| 65.4 | Ordained Bishop | Francesco Maria Tola † | Bishop of Bosa, Italy |
| 4 Jul | | Born | Flavien-Abel-Antoinin Hugonin † | | Bishop of Bayeux (-Lisieux), France |
| 6 Jul | 55.0 | Ordained Bishop | François-Antoine Arbaud † | Bishop of Gap, France |
| 23.2 | Ordained Priest | Dalmazio (Pietro) d’Andrea, O.F.M. Cap. † | Priest of Order of Friars Minor Capuchin | Bishop of Bova, Italy |
| 58.5 | Ordained Bishop | Robert Laffan † | Archbishop of Cashel (-Emly), Ireland |
| 74.1 | Ordained Bishop | Fortuné-Charles de Mazenod † | Bishop of Marseille, France | Bishop Emeritus |
| 66.6 | Ordained Bishop | Jean-Baptiste-François-Nicolas Millaux † | Bishop of Nevers, France |
| 64.4 | Ordained Bishop | André Molin † | Bishop of Viviers, France |
| 13 Jul | 55.9 | Ordained Bishop | Antoine-Jacques de Chamon † | Bishop of Saint-Claude, France |
| 44.5 | Ordained Bishop | Etienne-Bruno-Marie d’Arbou † | Bishop of Verdun, France | Bishop Emeritus of Bayonne, France |
| 24.5 | Ordained Priest | Giovanni Battista Ghiurekian † | Priest | Bishop of Trabzon (Trebisonda) (Armenian), Turkey |
| 53.3 | Ordained Bishop | Claude-Louis de Lesquen † | Bishop of Beauvais, France | Bishop Emeritus of Rennes, France |
| 64.2 | Ordained Bishop | Antoine de Pons de La Grange † | Bishop of Moulins, France |
| 68.7 | Ordained Bishop | Jean-François-Marie Le Pappe de Trévern † | Bishop of Aire, France | Bishop of Strasbourg, France |
| 63.4 | Ordained Bishop | Louis-Charles-François de La Tour-Landorte † | Bishop of Pamiers, France |
| Born | Giulio Marsili, O.F.M. Obs. † | | Bishop Emeritus of Sapë, Albania |
| 46.1 | Ordained Bishop | Vincenz Eduard Milde † | Bishop of Litoměřice, Czechia | Archbishop of Wien {Vienna}, Austria |
| 69.7 | Ordained Bishop | André-Etienne-Antoine de Morlhon † | Archbishop of Auch, France |
| 65.6 | Ordained Bishop | Antoine-Xavier de Neirac † | Bishop of Tarbes, France |
| 14 Jul | 34.5 | Appointed | Joseph Rosati, C.M. † | Coadjutor Bishop of Louisiana and the Two Floridas (Saint Louis of New Orleans), USA | Bishop of Saint Louis, Missouri, USA |
| 15 Jul | | Born | Cyril Lubowidzki † | | Bishop of Lutsk, Zhytomyr, and Kamyanets-Podilskyi (Łuck, Zytomierz, and Kamienec), Ukraine |
| 16 Jul | | Born | Giovanni Battista Alessio Tommasi † | | Bishop of Massa Carrara, Italy |
| 17 Jul | 49.8 | Selected | Gustave-Maximilien-Juste de Croÿ-Solre † | Cardinal, Archbishop of Rouen, France |
| 18 Jul | 76.5 | Died | Charles O’Donnell † | Bishop of Derry, Ireland |
| 19 Jul | 53.0 | Died | Francesco Stracchini † | Bishop of Segni, Italy |
| 20 Jul | | Ordained Bishop | Abraham Kupelian † | Bishop of Alep (Armenian), Syria |
| 63.9 | Ordained Bishop | Charles-Alexandre de Richery † | Bishop of Fréjus, France | Archbishop of Aix (-Arles-Embrun), France |
| 67.4 | Ordained Bishop | Philippe-François Sausin † | Bishop of Blois, France |
| 23 Jul | 70.9 | Installed | Charles Brault † | Archbishop of Albi, France |
| Born | Alexandre Antonin Taché, O.M.I. † | | Archbishop of Saint-Boniface, Manitoba, Canada |
| 29 Jul | 60.7 | Selected | Gilbert-Paul Aragonès d’Orcet † | Bishop of Langres, France |
| 55.1 | Installed | François-Antoine Arbaud † | Bishop of Gap, France |
| 30 Jul | 70.6 | Resigned | Jean-Baptiste-Marie Aubriot de la Palme † | Bishop of Aosta, Italy | Bishop Emeritus |
| 31 Jul | 66.6 | Installed | Jean-Baptiste-François-Nicolas Millaux † | Bishop of Nevers, France |
| 1 Aug | 66.8 | Resigned | Simon Melchior de Petris † | Vicar Apostolic of Seckau, Austria | Vicar Apostolic Emeritus |
| 5 Aug | | Born | Alfred Weld, S.J. † | | Superior Emeritus of Zambese, Zimbabwe |
| 6 Aug | 77.0 | Died | Jean Labartette, M.E.P. † | Vicar Apostolic of Cochin {Cocincina}, Viet Nam |
| 9 Aug | 26.3 | Professed | Jean-Baptiste Boucho, M.E.P. † | Priest of La Société des Missions Etrangères | Vicar Apostolic of Malacca-Singapore |
| 10 Aug | 79.7 | Died | [Robert Thomas Lindet] † | Bishop Emeritus of [Eure (Constitutional), France] |
| 91.7 | Died | François du Mouchet de Villedieu † | Bishop of Digne, France |
| 12 Aug | 80.6 | Died | Giuseppe Pannilini † | Bishop of Chiusi e Pienza, Italy |
| 13 Aug | 66.7 | Selected | Domenico Orlando, O.F.M. Conv. † | Bishop of Catania, Italy |
| 14 Aug | | Born | Gaspard Josephus Martinus Bottemanne † | | Bishop of Haarlem, Netherlands |
| 17 Aug | 23.0 | Ordained Priest | Michal Jan Marszewski † | Priest | Bishop of Włocławek (Kujawy, Kalisze), Poland |
| 19 Aug | 55.7 | Selected | Carlos de São José de Azevedo e Sousa, O.F.M. Obs. † | Bishop of Guarda, Portugal |
| 63.8 | Selected | Inocêncio António das Neves Portugal, O. Carm. † | Bishop of Faro {Algarve}, Portugal | Bishop-Elect |
| 20 Aug | 81.0 | Died | Barnaba (Gregorio) Chiaramonti, O.S.B. † | Pope (Roma {Rome}, Italy) |
| 66.1 | Resigned | Ercole Consalvi † | Secretary of State | Cardinal, Prefect of the Congregation for Propagation of the Faith |
| 23 Aug | 44.0 | Appointed | José Maria de Macerata, O.F.M. Cap. † | Prelate of Cuiabá, Brazil | Former Bishop-Elect of Cuiabá, Brazil |
| 27 Aug | 82.0 | Died | Szczepan Hołowczyc † | Archbishop of Warszawa {Warsaw}, Poland |
| 30 Aug | 56.0 | Installed | Antoine-Jacques de Chamon † | Bishop of Saint-Claude, France |
| 31 Aug | 66.5 | Died | Giulio Maria Alvisini † | Bishop of Fossombrone, Italy |