| Date | Age | Event | Bishop | Title | Current Title |
| May | 86.4 | Died | Cornelio di San Giuseppe (Giuseppe) Reina, O.C.D. † | Bishop of Ispahan, Iran |
| 8 May | | Born | Giacomo Luigi Brignole † | | Cardinal, Prefect of the Congregation of the Index |
| 17 May | 68.1 | Died | Juan Antonio Gallego y Orbigo, O.F.M. Disc. † | Archbishop of Manila, Philippines |
| 21 May | 24.1 | Ordained Priest | Giuseppe Maria Giove, O.F.M. Ref. † | Priest of Order of Reformed Friars Minor | Bishop of Gallipoli, Italy |
| 25 May | 23.9 | Ordained Priest | Józef Szczepan Koźmian † | Priest | Bishop of Włocławek (Kujawy, Kalisze), Poland |
| 28 May | 60.6 | Ordained Bishop | Grgo Ilijić, O.F.M. Obs. † | Titular Bishop of Ruspae |
| 4 Jun | 23.8 | Ordained Deacon | Giovanni Maria Bua † | Deacon | Archbishop of Oristano, Italy |
| 6 Jun | 23.8 | Ordained Priest | Giovanni Maria Bua † | Priest | Archbishop of Oristano, Italy |
| 7 Jun | 41.7 | Appointed | Cesare Brancadoro † | Secretary of the Congregation for Propagation of the Faith | Cardinal, Archbishop of Fermo, Italy |
| 10 Jun | 22.8 | Ordained Priest | Carlo Tommaso Arnosio † | Priest | Archbishop of Sassari, Italy |
| 24.1 | Ordained Priest | Ugolino Carlini † | Priest | Bishop of Cortona, Italy |
| 22.5 | Ordained Deacon | Marcin von Dunin Sulgostowski † | Deacon of Kraków, Poland | Archbishop of Gniezno e Poznań, Poland |
| 45.2 | Ordained Deacon | Filippo Ghighi † | Deacon of Arezzo, Italy | Bishop of Sovana (Soana), Italy |
| 23.0 | Ordained Priest | Johann Baptist Judas Thaddeus von Keller † | Priest of Rottenburg, Germany | Bishop |
| 13 Jun | | Born | Anton Fiałkowski † | | Archbishop of Mohilev, Belarus |
| 14 Jun | 43.7 | Selected | Giovanni Battista Canaveri, C.O. † | Bishop of Biella, Italy | Bishop of Vercelli, Italy |
| 50.2 | Selected | Giacinto della Torre, O.E.S.A. † | Archbishop (Personal Title) of Acqui, Italy | Archbishop of Torino {Turin}, Italy |
| 43.4 | Selected | Giuseppe Maria Pietro Grimaldi † | Bishop of Pinerolo, Italy | Archbishop of Vercelli, Italy |
| 63.7 | Selected | Vittorio Filippo Melano di Portula, O.P. † | Archbishop (Personal Title) of Novara, Italy | Bishop |
| 16 Jun | 29.3 | Ordained Priest | Godehard Joseph Osthaus † | Priest of Hildesheim, Germany | Bishop |
| 22 Jun | 72.6 | Died | [Nicolas Philbert], C.M. † | Bishop of [Ardennes (Constitutional), France] |
| 24 Jun | 69.7 | Died | Eustaquio Azara, O.S.B. † | Bishop of Barcelona, Spain |
| Born | John Joseph Hughes † | | Archbishop of New York, New York, USA |
| 26 Jun | | Born | Charles-Nicolas-Pierre Didiot † | | Bishop of Bayeux (-Lisieux), France |
| 60.5 | Succeeded | Stefan Lewiński † | Bishop of Lutsk and Ostroh (Ukrainian), Ukraine |
| 49.7 | Died | Michal Mateusz Stadnicki, O.S.B.M. † | Bishop of Lutsk and Ostroh (Ukrainian), Ukraine |
| 27 Jun | 61.7 | Resigned | [François-Antoine Brendel] † | Bishop of [Bas-Rhin (Constitutional), France] | Bishop Emeritus |
| 29 Jun | | Born | Ireneus Frederic Baraga † | | Bishop of Sault Sainte Marie and Marquette, Michigan, USA |
| 2 Jul | | Born | [Anton (Antonij) Zubko] † | | Archbishop |
| 3 Jul | 46.9 | Selected | Pedro Inocencio Bejarano † | Bishop of Buenos Aires, Argentina | Bishop of Sigüenza, Spain |
| 4 Jul | 51.5 | Died | Gerard Teahan (Teaghan) † | Bishop of Kerry (o Ardfert) e Aghadoe, Ireland |
| 15 Jul | | Born | Bénigne-Urbain-Jean-Marie du Trousset d’Héricourt † | | Bishop of Autun, France |
| 24 Jul | 51.9 | Appointed | Gregorio (Felix Antonius Paschalis) Boari, O.F.M. Cap. † | Bishop of Comacchio, Italy |
| 65.7 | Confirmed | Carlo Luigi Buronzo del Signore † | Archbishop of Torino {Turin}, Italy | Archbishop Emeritus |
| 68.6 | Appointed | Francisco Javier Cabrera Velasco † | Bishop of Ávila, Spain |
| 43.8 | Confirmed | Giovanni Battista Canaveri, C.O. † | Bishop of Biella, Italy | Bishop of Vercelli, Italy |
| 64.7 | Appointed | Simón Casaviella López † | Bishop of Tudela, Spain |
| 63.4 | Appointed | Francisco Antonio Cebrián y Valdá † | Bishop of Orihuela, Spain | Cardinal, Patriarch of West Indies, Spain |
| 42.3 | Appointed | Binkentios Coressi † | Bishop of Chios (Scio), Greece | Vicar Apostolic of Constantinople, Turkey |
| 55.9 | Confirmed | José da Costa e Torres † | Bishop of Elvas, Portugal | Archbishop of Braga, Portugal |
| 48.4 | Appointed | Francisco Rousset de Jesús y Rosas, O.F.M. Obs. † | Bishop of Sonora, México |
| 50.3 | Confirmed | Giacinto della Torre, O.E.S.A. † | Archbishop (Personal Title) of Acqui, Italy | Archbishop of Torino {Turin}, Italy |
| 51.8 | Appointed | Remigio de La Santa y Ortega † | Bishop of La Paz, Bolivia | Bishop of Lérida, Spain |
| 52.3 | Appointed | Pedro Agustín Estévez y Ugarte † | Bishop of Yucatán (Mérida), México |
| 30.7 | Appointed | Leopold Maximilian von Firmian (Frimian) † | Auxiliary Bishop of Passau, Germany | Archbishop of Wien {Vienna}, Austria |
| 30.7 | Appointed | Leopold Maximilian von Firmian (Frimian) † | Titular Bishop of Tiberias | Archbishop of Wien {Vienna}, Austria |
| 45.0 | Appointed | Juan García Benito † | Bishop of Tuy, Spain | Archbishop Emeritus of Santiago de Compostela, Spain |
| 49.1 | Appointed | Manuel Joaquín González de Acuña y Saenz † | Bishop of Panamá |
| 43.5 | Confirmed | Giuseppe Maria Pietro Grimaldi † | Bishop of Pinerolo, Italy | Archbishop of Vercelli, Italy |
| 50.1 | Appointed | José Antonio de la Huerta Caso † | Bishop of Nicaragua |
| 43.6 | Appointed | Francisco Antonio La Dueña Cisneros † | Bishop of Urgell, Spain | Bishop of Segorbe, Spain |
| 74.8 | Installed | Francisco Antonio de Lorenzana y Butrón † | Cardinal-Priest of Santi XII Apostoli | Cardinal, Archbishop Emeritus of Toledo, Spain |
| 51.5 | Appointed | Nikolla Malçi † | Bishop of Lezhë {Lesh, Alessio}, Albania |
| 63.8 | Confirmed | Vittorio Filippo Melano di Portula, O.P. † | Archbishop (Personal Title) of Novara, Italy | Bishop |
| 65.0 | Appointed | Klemens August Maria von Merle † | Auxiliary Bishop of Köln {Cologne}, Germany |
| 65.0 | Appointed | Klemens August Maria von Merle † | Titular Bishop of Bethsaida | Auxiliary Bishop of Köln {Cologne}, Germany |
| 52.8 | Appointed | Manuel Cayetano Muñoz Benavente † | Auxiliary Bishop of Sevilla {Seville}, Spain | Auxiliary Bishop Emeritus |
| 52.8 | Appointed | Manuel Cayetano Muñoz Benavente † | Titular Bishop of Lycopolis | Auxiliary Bishop Emeritus of Sevilla {Seville}, Spain |
| 57.9 | Appointed | Girolamo Pavesi † | Bishop of Pontremoli, Italy |
| 65.6 | Appointed | József Petheö † | Auxiliary Bishop of Pécs, Hungary |
| 65.6 | Appointed | József Petheö † | Titular Bishop of Methone | Auxiliary Bishop of Pécs, Hungary |
| 51.8 | Confirmed | Luis Rodrigues Vilares † | Bishop of Funchal, Portugal |
| 71.5 | Appointed | José Antonio Sáenz Santamaría † | Bishop of Segovia, Spain |
| 53.6 | Confirmed | Cypriano de São José, O.F.M. Ref. † | Bishop of Mariana, Brazil |
| 50.5 | Appointed | Pablo Sitjar Ruata † | Auxiliary Bishop of Barcelona, Spain | Bishop |
| 50.5 | Appointed | Pablo Sitjar Ruata † | Titular Bishop of Geras | Bishop of Barcelona, Spain |
| 53.1 | Appointed | Juan Antonio Tamayo, O.S. † | Titular Bishop of Botrys |
| 34.3 | Appointed | Emanuel Maria Thun † | Auxiliary Bishop of Trento, Italy | Bishop |
| 34.3 | Appointed | Emanuel Maria Thun † | Titular Bishop of Iasus | Bishop of Trento, Italy |
| 37.3 | Confirmed | Youssef Tian (Tyen) † | Patriarch of Antiochia {Antioch} (Maronite), Lebanon | Patriarch Emeritus |
| 59.7 | Appointed | Raimondo Luigi Vecchietti † | Coadjutor Bishop of Colle di Val d’Elsa, Italy | Bishop |
| 59.7 | Appointed | Raimondo Luigi Vecchietti † | Titular Bishop of Erythrum | Bishop of Colle di Val d’Elsa, Italy |
| 49.2 | Confirmed | Leopold Leonhard von Thun † | Bishop of Passau, Germany |
| 25 Jul | 57.9 | Ordained Bishop | Girolamo Pavesi † | Bishop of Pontremoli, Italy |
| 59.7 | Ordained Bishop | Raimondo Luigi Vecchietti † | Titular Bishop of Erythrum | Bishop of Colle di Val d’Elsa, Italy |
| 30 Jul | 51.9 | Ordained Bishop | Gregorio (Felix Antonius Paschalis) Boari, O.F.M. Cap. † | Bishop of Comacchio, Italy |
| 6 Aug | 43.8 | Ordained Bishop | Giovanni Battista Canaveri, C.O. † | Bishop of Biella, Italy | Bishop of Vercelli, Italy |
| 43.5 | Ordained Bishop | Giuseppe Maria Pietro Grimaldi † | Bishop of Pinerolo, Italy | Archbishop of Vercelli, Italy |
| 17 Aug | 60.6 | Died | Baltazar Jaime Martínez de Compañón † | Archbishop of Santafé en Nueva Granada, Colombia |
| 18 Aug | 66.5 | Died | Michelangelo Calandrelli, O.E.S.A. † | Bishop of Acerno, Italy |
| 21 Aug | 57.5 | Died | Grégoire Joseph Koudsi † | Archbishop of Jerusalem {Gerusalemme} (Syrian), Lebanon |
| 22 Aug | | Born | Augustin-Magloire-Alexandre Blanchet † | | Bishop Emeritus of Nesqually, Washington, USA |
| 25 Aug | 40.6 | Ordained Deacon | Francesco Cesarei Leoni † | Deacon | Cardinal, Bishop of Jesi, Italy |
| 27 Aug | 40.6 | Ordained Priest | Francesco Cesarei Leoni † | Priest | Cardinal, Bishop of Jesi, Italy |
| 77.2 | Died | José Gregorio Alonso de Ortigosa † | Bishop Emeritus of Antequera, Oaxaca, México |
| 49.3 | Ordained Bishop | Leopold Leonhard von Thun † | Bishop of Passau, Germany |
| 28 Aug | 86.9 | Died | Giovanni Battista Coppola † | Bishop of Cassano all’Jonio, Italy |
| 30 Aug | | Born | José López y Crespo † | | Bishop of Santander, Spain |