| Date | Age | Event | Bishop | Title | Current Title |
| May | 24.1 | Ordained Priest | Vicente Horcos y San Martín, O.S.B. † | Priest of Order of Saint Benedict | Bishop of Osma, Spain |
| 1 May | 83.0 | Died | Antonius van Alphen † | Vicar Apostolic of ’s Hertogenbosch (Bois-le-Duc), Netherlands |
| 22.3 | Ordained Priest | Richard Vincent Whelan † | Priest of Richmond, Virginia, USA | Bishop of Wheeling, West Virginia, USA |
| 2 May | | Born | François Hautin † | Paris | Archbishop of Chambéry, France |
| 87.2 | Died | Miguel Joaquín Matías Suárez, O.F.M. Cap. † | Auxiliary Bishop of Zaragoza, Spain |
| 12 May | | Born | Eustachio Vito Modesto Zanoli, O.F.M. † | Marbirazzo, Italy | Vicar Apostolic of Eastern Hupeh {Hu-Pè Orientale}, China |
| 14 May | 22.8 | Ordained Deacon | Domonkos Zichy-Vásonkeö † | Deacon | Bishop Emeritus of Veszprém, Hungary |
| 15 May | | Born | Augusto Bonetti, C.M. † | Murialdo | Apostolic Delegate to Turkey |
| 71.9 | Ordained Bishop | Francesco Saverio Caruana † | Bishop of Malta |
| 57.1 | Ordained Bishop | Juan Antonio Rivadeneyra † | Bishop of Valladolid, Spain |
| 67.7 | Died | Jan Jerzy Wilkxycki † | Auxiliary Bishop of Chelmno (Culma, Kulm), Poland |
| 19 May | | Born | José Ramón Astorga Salinas † | Santiago | Auxiliary Bishop of Santiago de Chile |
| Born | Giuseppe Benigno Perilla † | Somondoco | Bishop of Tunja, Colombia |
| 20 May | 22.7 | Ordained Priest | Francesco Saverio Basile † | Priest | Archbishop-Elect of Reggio Calabria, Italy |
| 23 May | 85.5 | Died | Theodorus Lauretanus Balbi † | Bishop of Novigrad (Cittanova), Croatia |
| 24 May | 66.7 | Died | Wenceslas Urban von Stuffler † | Bishop of Brno, Czech Republic |
| 25 May | | Born | Fernando Blaitt Mariño † | Santiago | Bishop of Concepción, Chile |
| 50.0 | Selected | Alessandro d’Angennes † | Archbishop of Vercelli, Italy |
| 28 May | 23.6 | Ordained Priest | Bonaventura Atanasio, C.SS.R. † | Priest of Congregation of the Most Holy Redeemer | Bishop Emeritus of Lipari, Italy |
| 24.0 | Ordained Priest | Karl Johann Greith † | Priest of Sankt Gallen, Switzerland | Bishop |
| 25.2 | Ordained Deacon | Johann Jakob Kraft † | Deacon of Trier, Germany | Auxiliary Bishop |
| 26.6 | Ordained Priest | Etienne Marilley † | Priest of Lausanne et Genève, Switzerland | Bishop Emeritus |
| 24.7 | Ordained Priest | Claude-Thierry Obré † | Priest | Auxiliary Bishop Emeritus of Beauvais (-Noyon-Senlis), France |
| 22.6 | Ordained Priest | Giuseppe Maria Sciandra † | Priest | Bishop of Acqui, Italy |
| 29 May | 22.8 | Ordained Priest | Luigi Giuseppe Nazari di Calabiana † | Priest | Archbishop of Milano {Milan}, Italy |
| 31 May | 62.1 | Resigned | Carlo Oppizzoni (Opizoni) † | Archbishop of Bologna, Italy | Cardinal, Archbishop Emeritus |
| 4 Jun | 69.0 | Died | Stefan (István) Csech (Cech) † | Bishop of Košice, Slovakia |
| 5 Jun | 61.5 | Appointed | Henricus den Dubbelden † | Vicar Apostolic of ’s Hertogenbosch (Bois-le-Duc), Netherlands |
| 6 Jun | | Born | Simeone Volonteri, P.I.M.E. † | Milan | Vicar Apostolic of Southern Honan {Ho-Nan Meridionale}, China |
| 7 Jun | | Born | Tomás Costa y Fornaguera † | Calella de la Costa | Archbishop of Tarragona, Spain |
| 12 Jun | 49.2 | Ordained Bishop | Juan José Bonel y Orbe † | Bishop of Málaga, Spain | Cardinal, Archbishop of Toledo, Spain |
| 15 Jun | 90.9 | Died | Francesco Saverio Gualtieri † | Bishop of Caserta, Italy |
| 17 Jun | 64.6 | Died | Andrés Esteban y Gómez † | Bishop of Jaén, Spain |
| 19 Jun | 58.6 | Ordained Bishop | Clemente Maria Basetti † | Bishop of Carpi, Italy |
| Born | Francesco Tavani † | Modena | Auxiliary Bishop of Sabina (-Farfa), Italy |
| 21 Jun | | Died | Ambrogio Bruci † | Bishop of Shkodrë (Scutari), Albania |
| 72.0 | Installed | Francesco Saverio Caruana † | Bishop of Malta |
| 28.1 | Professed | Pierre-André Retord, M.E.P. † | Priest of La Société des Missions Etrangères | Vicar Apostolic of Western Tonking {Tonkino Occidentale}, Viet Nam |
| 26 Jun | | Born | Salvatore Depau-Puddu † | Ulassai | Bishop of Ogliastra, Italy |
| 1 Jul | | Born | Alberto Cracchi, O.F.M. † | Landiona | Bishop of Pult, Albania |
| 62.3 | Installed | Francisco Pablo Vásquez Bizcaíno (y Sánchez) † | Bishop of Tlaxcala, México |
| 4 Jul | | Born | Alessandro Chiaruzzi † | Cesena | Bishop of Rimini, Italy |
| Born | Alfred Allen Paul Curtis † | Pocomoke, MD | Bishop Emeritus of Wilmington, Delaware, USA |
| 10 Jul | 50.0 | Selected | Cirilo de Alameda y Brea, O.F.M. † | Bishop of Santiago de Cuba | Cardinal, Archbishop of Toledo, Spain |
| 56.7 | Ordained Bishop | Marcin von Dundin Sulgustowski † | Archbishop of Gniezno e Poznań, Poland |
| Born | Janos Majorosy † | Al-Debrö | Auxiliary Bishop of Kalocsa, Hungary |
| 11 Jul | 77.3 | Died | Alexis Pótsy † | Bishop of Mukachevo (Munkács) (Ruthenian), Ukraine |
| 15 Jul | 62.2 | Died | Manuel Santo Galdino, O.F.M. † | Archbishop of Goa, India |
| 16 Jul | 55.4 | Died | Filippo Martuscelli † | Bishop of Muro Lucano, Italy |
| 17 Jul | 59.5 | Ordained Bishop | José María de Jesús Belaunzarán y Ureña, O.F.M. † | Bishop of Linares o Nueva León, Nuevo León, México | Bishop Emeritus |
| 18 Jul | 69.5 | Died | Augustin Milletich (Miletic), O.F.M. † | Vicar Apostolic of Bosniae Othomanae, Croatia |
| 22 Jul | 23.0 | Ordained Priest | Domonkos Zichy-Vásonkeö † | Priest | Bishop Emeritus of Veszprém, Hungary |
| 24 Jul | 43.5 | Died | Rudolf Johannes Joseph Rainier von Habsburg-Lotharingen † | Cardinal, Archbishop of Olomouc, Czech Republic |
| 27 Jul | | Born | Michał Nowodworski † | Vladislavien | Bishop of Płock, Poland |
| 30 Jul | 59.4 | Succeeded | Thomas Penswick † | Vicar Apostolic of Northern District, England, Great Britain |
| 78.0 | Died | Johann Adam Rieger † | Bishop of Fulda, Germany |
| 68.4 | Died | Thomas Smith † | Vicar Apostolic of Northern District, England, Great Britain |
| Aug | 51.6 | Appointed | Tommaso Bernetti † | Secretary of the Secretariat of State | Cardinal, Secretary Emeritus |
| 4 Aug | | Born | Domenico Marinangeli † | Rocca di Cambio | Titular Patriarch of Alexandria {Alessandria} |
| 6 Aug | 77.6 | Died | Columbano Giovanni Battista Carlo Gaspare Chiaverotti, O.S.B. † | Archbishop of Torino {Turin}, Italy |
| 8 Aug | | Selected | Giovanni Portelli † | Bishop of Lipari, Italy |
| 9 Aug | 23.5 | Ordained Priest | Franz Kaspar Drobe † | Priest of Paderborn, Germany | Bishop |
| 36.9 | Appointed | William Placid Morris, O.S.B. † | Vicar Apostolic of Cape of Good Hope, Western District {Capo di Buona Speranza, Distretto Occidentale}, South Africa | Vicar Apostolic Emeritus |
| 36.9 | Appointed | William Placid Morris, O.S.B. † | Titular Bishop of Troas | Vicar Apostolic Emeritus of Cape of Good Hope, Western District {Capo di Buona Speranza, Distretto Occidentale}, South Africa |
| 57.6 | Resigned | Edward Bede Slater, O.S.B. † | Vicar Apostolic of Cape of Good Hope {Capo de Buona Speranza}, South Africa | Vicar Apostolic Emeritus |
| 10 Aug | 21.9 | Ordained Deacon | Franz Sniegoń † | Deacon of Wrocław (Breslau), Poland | Auxiliary Bishop |
| 14 Aug | | Born | Cirillo Benham Benni † | Mossul | Patriarch of Antiochia {Antioch} (Syrian), Lebanon |
| 19 Aug | 35.2 | Appointed | Clément Bonnand, M.E.P. † | Coadjutor Vicar Apostolic of Malabar, India | Vicar Apostolic of Pondicherry, India |
| 35.2 | Appointed | Clément Bonnand, M.E.P. † | Titular Bishop of Druzipara | Vicar Apostolic of Pondicherry, India |
| 21 Aug | 48.1 | Ordained Bishop | Juan Cayetano José María Gómez de Portugal y Solis † | Bishop of Michoacán, México |
| 54.4 | Ordained Bishop | José Miguel Gordoa y Barrios † | Bishop of Guadalajara, Jalisco, México |
| 84.2 | Died | Pablo Sitjar Ruata † | Bishop of Barcelona, Spain |
| 26 Aug | 36.7 | Appointed | George Joseph Plunkett Browne † | Bishop of Galway, Ireland | Bishop of Elphin, Ireland |
| 28 Aug | 67.3 | Died | Pedro Rodriguez de Miranda, O. de M. † | Bishop of Jaca, Spain |
| 40.1 | Ordained Bishop | José Antonio Laureano de Zubiría y Escalante † | Bishop of Durango, México |
| 30 Aug | | Died | Maximos Givaid (Jouwed) † | Titular Patriarch of Alexandria {Alessandria} (Coptic), Egypt |