| Date | Age | Event | Bishop | Title | Current Title |
| 1 Apr | 76.9 | Died | Pierre-Michel-Marie Double † | Bishop of Tarbes, France |
| 2 Apr | | Born | Ulisse Carlo Bascherini † | | Bishop Emeritus of Grosseto, Italy |
| 5 Apr | | Born | Domenico Ambrosi † | | Bishop of Terracina, Priverno e Sezze, Italy |
| 6 Apr | 84.2 | Died | Domenico Benedetto Balsamo, O.S.B. † | Archbishop of Monreale, Italy |
| Born | Federico de Martino † | | Bishop of Castellaneta, Italy |
| 23.2 | Ordained Priest | Beniamino Feuli † | Priest | Archbishop of Manfredonia (e Vieste), Italy |
| 22.9 | Ordained Priest | Francesco Latoni † | Priest | Bishop of Senigallia, Italy |
| 7 Apr | | Born | Théodore-Herman Rutjes, C.I.C.M. † | | Vicar Apostolic of Eastern Mongolia {Mongolia Orientale}, China |
| 8 Apr | | Born | Spiridion Poloméni † | | Auxiliary Bishop of Carthage, Tunisia |
| 10 Apr | 81.5 | Died | Ignazio Cafisi † | Auxiliary Bishop of Agrigento (Girgenti), Italy |
| 12 Apr | | Born | Balthasar Kaltner † | | Archbishop of Salzburg, Austria |
| 14 Apr | 37.2 | Ordained Bishop | Karl Pooten † | Titular Bishop of Maronea | Archbishop of Bar (Antivari), Montenegro |
| 37.8 | Installed | William Barber Tyler † | Bishop of Hartford, Connecticut, USA |
| 16 Apr | 71.8 | Died | Juan Antonio Díez Merino, O.P. † | Bishop of Menorca, Spain |
| 57.1 | Appointed | Joseph Norbert Provencher † | Vicar Apostolic of North-West (Nord-Ouest), Canada | Bishop of Saint-Boniface, Manitoba, Canada |
| 19 Apr | | Born | Albert-Léon-Marie Le Nordez † | | Bishop Emeritus of Dijon, France |
| 17.2 | Professed | Tommaso Maria Martinelli, O.E.S.A. † | Member of Order of Hermits of St. Augustine | Cardinal, Prefect of the Congregation of the Index |
| 87.3 | Died | Bartolomeo Pacca † | Cardinal, Secretary of the Congregation for Universal Inquisition |
| 21 Apr | | Born | Jules-Auguste Chatron, M.E.P. † | | Bishop of Osaka, Japan |
| 39.2 | Ordained Bishop | José Affonso de Moraes Torres, C.M. † | Bishop of Belém do Pará, Brazil | Bishop Emeritus |
| Born | Dominikus (Martin Karl) Willi, O. Cist. † | | Bishop of Limburg, Germany |
| 25 Apr | 47.4 | Selected | Bernard Buissas † | Bishop of Limoges, France |
| 48.1 | Selected | Jean-Irénée Depéry † | Bishop of Gap, France |
| 48.6 | Selected | Marie-Auguste Fabre-des-Essarts † | Bishop of Blois, France |
| 73.6 | Appointed | Vincenzo Macchi † | Secretary of the Congregation for Universal Inquisition | Cardinal, Cardinal-Bishop of Ostia (e Velletri) |
| 52.2 | Selected | Daniel-Victor Manglard † | Bishop of Saint-Dié, France |
| 54.3 | Selected | Louis Rossat † | Bishop of Verdun, France |
| 28 Apr | | Born | Francisco Javier Baztán y Urniza † | | Bishop Emeritus of Oviedo, Spain |
| 55.5 | Appointed | Benedetto Colonna Barberini di Sciarra † | Cardinal, Archpriest of the Arcibasilica di San Giovanni in Laterano {Saint John Lateran Basilica} |
| 30.2 | Ordained Bishop | Eugène-Jean-Claude-Joseph Desflèches, M.E.P. † | Titular Bishop of Sinitis | Vicar Apostolic Emeritus of Eastern Szechwan {Se-Ciuen Orientale}, China |
| 29 Apr | 52.8 | Appointed | Ugo Pietro Spinola † | Cardinal, Pro-Datary of the Apostolic Datary |
| May | 68.6 | Selected | Antonio Uda † | Bishop of Bosa, Italy |
| 1 May | 68.5 | Appointed | Ludovico Micara, O.F.M. Cap. † | Prefect of the Congregation of Ceremonies | Cardinal, Cardinal-Bishop of Ostia (e Velletri) |
| 3 May | 23.3 | Ordained Deacon | Manuel Ulloa y Calvo † | Deacon of Nicaragua | Bishop |
| 5 May | 56.9 | Ordained Bishop | Antônio Ferreira Viçoso, C.M. † | Bishop of Mariana, Brazil |
| 23.3 | Ordained Priest | Manuel Ulloa y Calvo † | Priest of Nicaragua | Bishop |
| 6 May | | Born | Gustave-Marie-Jean Blanc, M.E.P. † | | Vicar Apostolic of Corea |
| Born | Bernardino Nozaleda y Villa, O.P. † | | Archbishop Emeritus of Valencia, Spain |
| 7 May | 48.6 | Appointed | François-Norbert Blanchet † | Titular Bishop of Draso | Archbishop Emeritus of Oregon City, Oregon, USA |
| 9 May | | Born | Stephen Reville, O.E.S.A. † | | Bishop of Sandhurst, Australia |
| 10 May | 25.3 | Professed | Jean-Yves-Marie Coadou, M.E.P. † | Member of La Société des Missions Etrangères | Bishop of Mysore, India |
| 11 May | 49.4 | Installed | Robert William Willson (Wilson) † | Bishop of Hobart, Australia | Bishop Emeritus |
| 16 May | 79.4 | Died | Josef Knauer † | Bishop of Wrocław (Breslau), Poland |
| 19 May | | Born | Gaetano Bacile di Castiglione † | | Bishop Emeritus of Castellaneta, Italy |
| Born | Manuel Tovar y Chamorro † | | Archbishop of Lima, Peru |
| 20 May | 36.6 | Selected | Bonaventura Attanasio, C.Ss.R. † | Bishop of Lipari, Italy | Bishop Emeritus |
| 59.9 | Selected | Rosario Vincenzo Benza † | Bishop of Nicosia, Italy |
| 72.2 | Selected | Pier Francesco Brunaccini, O.S.B. † | Bishop of Piazza Armerina, Italy | Archbishop of Monreale, Italy |
| 37.8 | Selected | Pietro Cilento † | Archbishop of Rossano, Italy |
| 56.5 | Selected | Luigi Giamporcaro † | Bishop of Monopoli, Italy |
| 58.1 | Selected | Domenico-Maria-Giuseppe Lo Jacono, C.R. † | Bishop of Agrigento (Girgenti), Italy |
| 60.9 | Selected | Giuseppe Maria Maniscalco, O.F.M. Obs. † | Bishop of Avellino, Italy | Bishop of Caltagirone, Italy |
| 40.8 | Selected | Vincenzo Maria Marolda, C.Ss.R. † | Bishop of Trapani, Italy | Bishop of Capaccio e Vallo della Lucania, Italy |
| 49.9 | Selected | Giuseppe Menditto † | Bishop of Noto, Italy | Bishop Emeritus |
| 61.0 | Selected | Martino Ursino (Orsino) † | Bishop of Patti, Italy |
| 63.2 | Selected | Giovanni Maria Visconte Proto, O.S.B. † | Bishop of Cefalù, Italy |
| 59.3 | Selected | Domenico Silvestri † | Archbishop of Sorrento, Italy |
| 26 May | 67.1 | Ordained Bishop | Manuel Pires de Azevedo Loureiro † | Bishop of Beja, Portugal |
| 27 May | | Born | André-Théophile Mélizan, O.M.I. † | | Archbishop of Colombo, Sri Lanka |
| Born | John Ambrose Watterson † | | Bishop of Columbus, Ohio, USA |
| 29 May | | Born | Otto (Lorenz) Hopfenmüller, S.D.S. † | | Prefect of Assam, India |
| 1 Jun | 23.7 | Ordained Priest | Giuseppe Boraggini † | Priest | Bishop of Savona e Noli, Italy |
| 24.6 | Ordained Priest | Julien Costes † | Priest of Rodez, France | Bishop Emeritus of Mende, France |
| 27.2 | Ordained Priest | Claude Marie Dubuis † | Priest of Lyon (-Vienne), France | Bishop Emeritus of Galveston, Texas, USA |
| 32.4 | Ordained Priest | Wilhelm Emmanuel von Ketteler † | Priest of Münster, Germany | Bishop of Mainz, Germany |
| 25.2 | Ordained Priest | Nicolas-Michel Krick, M.E.P. † | Priest | Prefect of Lhassa, China |
| 22.8 | Ordained Priest | Giovacchino Limberti † | Priest | Archbishop of Firenze {Florence}, Italy |
| 24.0 | Ordained Priest | Domenico Pietromarchi † | Priest | Bishop of Anagni, Italy |
| 24.0 | Ordained Priest | Nicola de Simone † | Priest | Bishop of Bova, Italy |
| 23.5 | Ordained Priest | José María de Jesús Díez de Sollano y Dávalos † | Priest of México, Federal District | Bishop of León, Guanajuato, México |
| 2 Jun | 46.5 | Ordained Bishop | José Xavier de Cerveira e Sousa † | Bishop of Funchal, Portugal | Bishop of Viseu, Portugal |
| 67.7 | Ordained Bishop | Carlos de São José e Souza, O.C.D. † | Bishop of São Luís do Maranhão, Brazil |
| 3 Jun | | Born | Massimiliano Novelli † | | Bishop Emeritus of Colle di Val d’Elsa, Italy |
| 9 Jun | 60.4 | Ordained Bishop | Antonio Mantecón y Ibáñez † | Bishop of Antequera, Oaxaca, México |
| 11 Jun | 22.1 | Ordained Deacon | Franz Gašparić † | Deacon of Zagreb, Croatia | Auxiliary Bishop |
| 13 Jun | 76.7 | Died | Giuseppe Novak † | Archbishop Emeritus of Zadar (Zara), Croatia |
| 15 Jun | 74.4 | Died | Salvador de Apodaca y Loreto † | Bishop of Linares o Nueva León, Nuevo León, México |
| 16 Jun | 55.2 | Ordained Bishop | António Bernardo da Fonseca Monís † | Bishop of Faro {Algarve}, Portugal | Bishop of Porto, Portugal |
| 46.3 | Ordained Bishop | Giovanni Battista Montixi † | Bishop of Iglesias, Italy |
| 17 Jun | 61.2 | Confirmed | Gábor Balassa † | Bishop of Szombathely, Hungary |
| 48.7 | Confirmed | Louis-Marie-Edmond Blanquart de Bailleul † | Archbishop of Rouen, France | Archbishop Emeritus |
| 72.3 | Confirmed | Pier Francesco Brunaccini, O.S.B. † | Bishop of Piazza Armerina, Italy | Archbishop of Monreale, Italy |
| 47.5 | Confirmed | Bernard Buissas † | Bishop of Limoges, France |
| 39.4 | Appointed | Jerónimo José de Mata, C.M. † | Titular Bishop of Colophon | Bishop Emeritus of Macau, China |
| 39.4 | Confirmed | Jerónimo José de Mata, C.M. † | Coadjutor Bishop of Macau, China | Bishop Emeritus |
| 48.2 | Confirmed | Jean-Irénée Depéry † | Bishop of Gap, France |
| 48.8 | Confirmed | Marie-Auguste Fabre-des-Essarts † | Bishop of Blois, France |
| 56.6 | Confirmed | Luigi Giamporcaro † | Bishop of Monopoli, Italy |
| 61.3 | Appointed | Franz Großmann (Grossmann) † | Auxiliary Bishop of Warmia (Ermland), Poland |
| 61.3 | Appointed | Franz Großmann (Grossmann) † | Titular Bishop of Amyzon | Auxiliary Bishop of Warmia (Ermland), Poland |
| 49.6 | Confirmed | Jean-Nicaise Gros † | Bishop of Versailles, France |
| 58.2 | Confirmed | Domenico-Maria-Giuseppe Lo Jacono, C.R. † | Bishop of Agrigento (Girgenti), Italy |
| 52.3 | Confirmed | Daniel-Victor Manglard † | Bishop of Saint-Dié, France |
| 61.0 | Confirmed | Giuseppe Maria Maniscalco, O.F.M. Obs. † | Bishop of Avellino, Italy | Bishop of Caltagirone, Italy |
| 51.7 | Appointed | Mario Mattei † | Cardinal-Bishop of Frascati | Cardinal, Cardinal-Bishop of Ostia (e Velletri) |
| 68.6 | Appointed | Ludovico Micara, O.F.M. Cap. † | Cardinal, Cardinal-Bishop of Ostia (e Velletri) |
| 58.7 | Confirmed | Alojzije Marija Pini † | Bishop of Split-Makarska (Spalato-Macarska), Croatia |
| 63.3 | Confirmed | Giovanni Maria Visconte Proto, O.S.B. † | Bishop of Cefalù, Italy |
| 54.5 | Confirmed | Louis Rossat † | Bishop of Verdun, France |
| 59.4 | Confirmed | Domenico Silvestri † | Archbishop of Sorrento, Italy |
| 18 Jun | 49.6 | Ordained Bishop | Taddeo Łubieński † | Titular Bishop of Rhodiapolis | Auxiliary Bishop of Włocławek (Kujawy, Kalisze), Poland |
| Born | Gustavo Provveduti † | | Abbot of San Martino al Monte Cimino, Italy |
| 21 Jun | 66.0 | Died | Joaquín Abarca Blaque † | Bishop of León, Spain |
| 23 Jun | 61.0 | Ordained Bishop | Giuseppe Maria Maniscalco, O.F.M. Obs. † | Bishop of Avellino, Italy | Bishop of Caltagirone, Italy |
| 51.7 | Ordained Bishop | Mario Mattei † | Cardinal-Bishop of Frascati | Cardinal, Cardinal-Bishop of Ostia (e Velletri) |
| 24 Jun | 87.4 | Died | Abbon-Pierre-François Bonnel de la Brageresse † | Bishop Emeritus of Viviers, France |
| Born | Juan Gomez (Comes) y Vidal † | | Bishop Emeritus of Teruel (-Albarracín), Spain |
| 59.4 | Ordained Bishop | Domenico Silvestri † | Archbishop of Sorrento, Italy |
| 25 Jun | | Born | Vincenzo Epiphane Carlassare, O.F.M. Ref. † | | Vicar Apostolic of Eastern Hupeh {Hu-Pè Orientale}, China |
| 30 Jun | 66.7 | Died | Giovanni Battista Bellé † | Bishop of Mantova, Italy |
| 58.2 | Ordained Bishop | Domenico-Maria-Giuseppe Lo Jacono, C.R. † | Bishop of Agrigento (Girgenti), Italy |
| 49.1 | Ordained Bishop | Peter-Josef de Preux † | Bishop of Sion {Sitten}, Switzerland |