| Date | Age | Event | Bishop | Title | Current Title |
| Apr | 70.3 | Appointed | Placido Ralli † | Secretary of the Congregation of (Sacred) Rites | Titular Patriarch of Antiochia {Antioch} |
| 1 Apr | 22.1 | Ordained Priest | Ignacio Díaz y Macedo † | Priest | Bishop of Tepic, Nayarit, México |
| 4 Apr | 48.0 | Ordained Bishop | Nicola Ghilardi † | Archbishop of Lucca, Italy |
| 63.8 | Ordained Bishop | Giuseppe Maria Maragioglio, O.F.M. Cap. † | Bishop of Patti, Italy |
| 58.7 | Ordained Bishop | Giovanni Simeoni † | Titular Archbishop of Chalcedon | Cardinal, Prefect of the Congregation for Propagation of the Faith |
| 11 Apr | 39.9 | Ordained Bishop | Angelo Bersani-Dossena † | Titular Bishop of Patara | Coadjutor Bishop of Lodi, Italy |
| 23.3 | Ordained Deacon | Georg Schmid von Grüneck † | Deacon of Chur, Switzerland | Bishop |
| 74.6 | Ordained Bishop | Carmelo Scicluna † | Bishop of Malta |
| 12 Apr | | Born | Stanislaw Adamski † | | Bishop of Katowice, Poland |
| 15 Apr | | Born | Jean Kurio † | | Bishop of Amadiyah (Chaldean), Iraq |
| 17 Apr | 44.7 | Installed | Giovanni Battista Bongiorni † | Bishop of Trapani, Italy | Bishop Emeritus of Caltagirone, Italy |
| 18 Apr | 84.6 | Ordained Bishop | José Domingo Armestar Espinoza de los Monteros † | Bishop of Trujillo, Peru |
| Born | Ercole Attuoni † | | Archbishop of Fermo, Italy |
| 43.1 | Ordained Bishop | John O’Brien † | Bishop of Kingston, Ontario, Canada |
| 48.9 | Ordained Bishop | Ivan Pasteliy (János Pásztélyi) Kovach (Kovács) † | Bishop of Mukachevo (Munkács) (Ruthenian), Ukraine |
| 20 Apr | 81.1 | Died | Raffaele Ferrigno † | Archbishop of Brindisi, Italy |
| 23 Apr | 73.2 | Selected | Pedro José Chávez Ponce † | Bishop of Puno, Peru |
| 24 Apr | 24.5 | Ordained Deacon | Ilija Hranilović † | Deacon of Križevci (Kreutz) (Križevci), Croatia | Bishop |
| 25 Apr | 47.6 | Ordained Bishop | Giacomo Corna-Pellegrini † | Titular Bishop of Sebaste in Palaestina | Bishop of Brescia, Italy |
| Born | Florian-Jean-Baptiste Demange, M.E.P. † | | Vicar Apostolic of Taiku, Korea (South) |
| Born | Bl. Valeriu Traian Frentiu † | | Bishop of Oradea Mare {Gran Varadino} (Romanian), Romania |
| 24.5 | Ordained Priest | Ilija Hranilović † | Priest of Križevci (Kreutz) (Križevci), Croatia | Bishop |
| 54.8 | Ordained Bishop | Domenico Pietromarchi † | Bishop of Anagni, Italy |
| 1 May | 49.4 | Ordained Bishop | Charles-Pierre-François Cotton † | Bishop of Valence, France |
| 85.2 | Died | Patrick Durcan † | Bishop of Achonry, Ireland |
| 53.5 | Ordained Bishop | Jules François Lecoq † | Bishop of Luçon, France | Bishop of Nantes, France |
| 42.0 | Succeeded | Francis McCormack † | Bishop of Achonry, Ireland | Bishop Emeritus of Galway and Kilmacduagh, Ireland |
| 2 May | 53.0 | Installed | John Joseph Williams † | Archbishop of Boston, Massachusetts, USA |
| 3 May | | Born | Bl. Cruz Laplana y Laguna † | | Bishop of Cuenca, Spain |
| 4 May | 65.7 | Died | Dominik Mayer † | Bishop of Austria, Military |
| 6 May | | Born | Joseph Gjonali (Gionali) † | | Bishop Emeritus of Sapë, Albania |
| 53.0 | Ordained Bishop | Cassien-Léonard de Péretti † | Titular Bishop of Ptolemais in Phoenicia | Auxiliary Bishop of Ajaccio, France |
| 9 May | 68.9 | Died | Francesco Andreoli † | Bishop of Cagli e Pergola, Italy |
| 51.6 | Ordained Bishop | Odon Thibaudier † | Titular Bishop of Sidon | Archbishop of Cambrai, France |
| 10 May | 56.1 | Selected | François-Marie-Benjamin Richard de la Vergne † | Coadjutor Archbishop of Paris, France | Cardinal, Archbishop |
| 11 May | | Born | Giuseppe Migone † | | Secret Almoner of the Office of Papal Charities |
| Born | António Maria Teixeira † | | Bishop of Săo Tomé of Meliapore, India |
| 12 May | 70.2 | Died | Heinrich von Hofstätter † | Bishop of Passau, Germany |
| 13 May | 62.7 | Died | Lorenzo Bergeretti, O.F.M. Ref. † | Archbishop of Naxos, Greece |
| 15 May | 22.6 | Professed | Casimir Vic, C.M. † | Member of Congregation of the Mission | Vicar Apostolic of Eastern Kiangsi {Kiam-Si Orientale}, China |
| 17 May | 75.7 | Selected | Esteban José Pérez Fernández † | Archbishop (Personal Title) of Málaga, Spain | Bishop |
| 18 May | | Born | Joachim Rodrigues Lima, S.J. † | | Archbishop of Bombay, India |
| 19 May | 84.7 | Installed | José Domingo Armestar Espinoza de los Monteros † | Bishop of Trujillo, Peru |
| 20 May | 21.1 | Professed | Paul-Marie Reynaud, C.M. † | Member of Congregation of the Mission | Vicar Apostolic of Ningpo [Ningbo], China |
| 21 May | | Born | Patrick Lyons † | | Bishop of Kilmore, Ireland |
| 22 May | 22.5 | Ordained Priest | Antonio Maria Bonito † | Priest | Archbishop Emeritus of Amalfi, Italy |
| 30.0 | Ordained Priest | Maurice Francis Burke † | Priest of Chicago, Illinois, USA | Bishop of Saint Joseph, Missouri, USA |
| 23.2 | Ordained Priest | Antonio Augusto Intreccialagli, O.C.D. † | Priest of Order of Discalced Carmelites | Archbishop of Monreale, Italy |
| 22.6 | Ordained Priest | Henri Joulain, O.M.I. † | Priest of Oblates of Mary Immaculate | Bishop of Jaffna, Sri Lanka |
| 22.4 | Ordained Deacon | Peter Joseph Lausberg † | Deacon of Köln {Cologne}, Germany | Auxiliary Bishop |
| 23.6 | Ordained Priest | Adolph Manier † | Priest of Autun (-Châlon-sur-Saône-Mâcon), France | Bishop of Belley, France |
| 22.5 | Ordained Priest | Edoardo Pulciano † | Priest | Archbishop of Genova, Italy |
| 24.5 | Ordained Priest | Pie Armand Pierre Sabadel, O.F.M. Cap. † | Priest of Order of Friars Minor Capuchin | Titular Bishop of Corinthus |
| 23 May | 45.3 | Died | Paolo Carnevali (Carnevale), O.F.M. Obs. † | Coadjutor Vicar Apostolic of Shansi {Scian-Si} (Chan-Si), China |
| 56.6 | Installed | Martin Crane, O.E.S.A. † | Bishop of Sandhurst, Australia |
| 33.9 | Ordained Bishop | John Joseph Kain † | Bishop of Wheeling, West Virginia, USA | Archbishop of Saint Louis, Missouri, USA |
| 25 May | 18.1 | Professed | Charles Warren Currier † | Member of Congregation of the Most Holy Redeemer | Bishop Emeritus of Matanzas, Cuba |
| 62.2 | Died | Claude-Henri-Augustin Plantier † | Bishop of Nîmes, France |
| 27 May | | Born | Anton Akšamović † | | Bishop Emeritus of Bosna (Djakovo) et Srijem, Croatia |
| 46.2 | Selected | Josef Jan Evangelista Hais † | Bishop of Hradec Králové, Czechia |
| 28 May | 47.1 | Appointed | Ambrose Notyn Darauni † | Titular Archbishop of Adana |
| 29 May | 63.1 | Selected | Juraj (Giorgio) Dobrila † | Bishop of Trieste e Capodistria (Trst i Koper), Italy |
| 75.4 | Died | Motiejus Wołonczewscki † | Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania |
| 30 May | 51.9 | Appointed | Aleksander Kazimierz Bereśniewicz † | Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania | Bishop Emeritus of Włocławek (Kujawy, Kalisze), Poland |
| 47.1 | Ordained Bishop | Ambrose Notyn Darauni † | Titular Archbishop of Adana |
| 44.6 | Ordained Bishop | Rupert (Albert) Seidenbusch, O.S.B. † | Titular Bishop of Alia | Vicar Apostolic Emeritus of Northern Minnesota, USA |
| 68.2 | Died | Adrian Włodarski † | Auxiliary Bishop of Wrocław (Breslau), Poland |
| 31 May | 84.2 | Died | Józef Grzegorz Wojtarowicz † | Bishop Emeritus of Tarnów, Poland |
| 2 Jun | 45.1 | Ordained Bishop | James Augustine Healy † | Bishop of Portland, Maine, USA |
| 4 Jun | 65.0 | Selected | Francisco de Paula Benavides y Navarrete, O.S. † | Patriarch of West Indies, Spain | Cardinal, Archbishop of Zaragoza, Spain |
| 44.3 | Selected | Zeferino González y Díaz Tuńón, O.P. † | Bishop of Córdoba, Spain | Cardinal, Archbishop Emeritus of Sevilla {Seville}, Spain |
| 57.5 | Selected | Juan de la Cruz Ignacio Moreno y Maisanove † | Cardinal, Archbishop of Toledo, Spain |
| 6 Jun | 50.9 | Ordained Bishop | Jaak Bax, C.I.C.M. † | Titular Bishop of Adrasus | Vicar Apostolic of Central Mongolia {Mongolia Centrale}, China |
| 45.4 | Ordained Bishop | Mariano Cuartero y Sierra, O.A.R. † | Bishop of Nueva Segovia, Philippines |
| 60.1 | Ordained Bishop | José Maria da Silva Ferrăo de Carvalho Mártens † | Bishop of Bragança e Miranda, Portugal | Bishop of Portalegre, Portugal |
| 8 Jun | 63.3 | Selected | Francisco de Sales Crespo y Bautista † | Bishop of Mondońedo, Spain |
| 44.5 | Appointed | Pierre-Paul Durieu, O.M.I. † | Coadjutor Vicar Apostolic of British Columbia, Canada | Bishop of New Westminster, British Columbia, Canada |
| 44.5 | Appointed | Pierre-Paul Durieu, O.M.I. † | Titular Bishop of Marcopolis | Bishop of New Westminster, British Columbia, Canada |
| 24.7 | Entered | Galeas (Galeazzo) von Thun und Hohenstein, S.M.O.M. † | Member of Sovereign Military Hospitaller Order of Saint John of Jerusalem, of Rhodes and of Malta | Grand Master |
| 10 Jun | 56.0 | Selected | Friedrich Josef von Schreiber † | Archbishop of Bamberg, Germany |
| 11 Jun | 45.6 | Selected | Nándor Dulánszky † | Bishop of Székesfehérvár (Albareale), Hungary | Bishop of Pécs, Hungary |
| 12 Jun | 53.1 | Selected | Jean-Joseph Marchal † | Bishop of Belley, France | Archbishop of Bourges, France |
| 13 Jun | 23.3 | Ordained Priest | Alejandro Cańál, O.P. † | Priest of Order of Friars Preachers |
| 23.8 | Ordained Priest | Maximino Velasco, O.P. † | Priest of Order of Friars Preachers | Vicar Apostolic of Northern Tonking {Tonkino Settentrionale}, Viet Nam |
| 14 Jun | 75.2 | Died | Grzegorz Michał Szymonowicz † | Archbishop of Lviv (Armenian), Ukraine |
| 17 Jun | | Born | Maurice Francis McAuliffe † | | Bishop of Hartford, Connecticut, USA |
| 18 Jun | | Born | John Barry † | | Bishop of Goulburn, Australia |
| 58.3 | Selected | Gabino Catalina del Amo † | Bishop of Calahorra y La Calzada, Spain |
| 37.1 | Selected | Vicente Calvo y Valero † | Bishop of Santander, Spain | Bishop of Cádiz y Ceuta, Spain |
| 48.3 | Selected | Saturnino Fernandez de Castro y de la Cotera † | Bishop of León, Spain | Archbishop of Burgos, Spain |
| 39.8 | Selected | José María Martín de Herrera y de la Iglesia † | Archbishop of Santiago de Cuba | Cardinal, Archbishop of Santiago de Compostela, Spain |
| 21 Jun | 65.1 | Resigned | Francisco de Paula Benavides y Navarrete, O.S. † | Bishop of Sigüenza, Spain | Cardinal, Archbishop of Zaragoza, Spain |
| 44.3 | Resigned | Zeferino González y Díaz Tuńón, O.P. † | Bishop-Elect of Málaga, Spain | Cardinal, Archbishop Emeritus of Sevilla {Seville}, Spain |
| 47.6 | Selected | José María Orberá y Carrión † | Bishop of Almería, Spain |
| 22 Jun | 16.2 | Professed | Pellegrino Francesco Stagni, O.S.M. † | Member of Order of Friar Servants of Mary | Archbishop Emeritus of L’Aquila, Italy |
| 23 Jun | 53.4 | Selected | Sebastián Herrero y Espinosa de los Monteros, C.O. † | Bishop of Cuenca, Spain | Cardinal, Archbishop of Valencia, Spain |
| 51.5 | Resigned | Juan María Ambrosio Huerta Galván † | Bishop of Puno, Peru | Bishop of Arequipa, Peru |
| 22.5 | Ordained Priest | Pasquale Morganti, O.Ss.C.A. † | Priest of Milano {Milan}, Italy | Archbishop of Ravenna, Italy |
| Born | Bernardin Shlaku, O.F.M. † | | Bishop of Pult (Pulati), Albania |
| 24 Jun | | Born | George Henry Bennett † | | Bishop of Aberdeen, Scotland, Great Britain |
| 25 Jun | 52.4 | Appointed | Thomas William Croke † | Archbishop of Cashel (-Emly), Ireland |
| 27 Jun | | Born | Pjetër Gjura † | | Archbishop of Durrës (Durazzo), Albania |
| 29 Jun | 51.4 | Ordained Bishop | Francis Xavier Krautbauer † | Bishop of Green Bay, Wisconsin, USA |
| 22.6 | Ordained Priest | Carmelo Pujia † | Priest | Archbishop of Reggio Calabria, Italy |
| 30 Jun | | Born | Giuseppe Bruno † | | Cardinal, Prefect of the Apostolic Signatura |