| Date | Age | Event | Bishop | Title | Current Title |
| unknown | | Born | Giuseppe Bonventura Berardi, O.F.M. Conv. † | Ravenna, Italy | Bishop of Bacău, Romania |
| 27.6 | Ordained Priest | Joseph Ernest Gandolph von Kuenburg † | Priest of Salzburg, Austria | Bishop of Lavant, Slovenia |
| Died | John MacColgan † | Bishop of Derry, Ireland |
| 35.2 | Ordained Priest | Francisco José Marán † | Priest of Cuzco, Peru | Bishop of Santiago de Chile |
| 23.2 | Ordained Priest | Pierre-Joseph-Georges Pigneau de Béhaine, M.E.P. † | Priest of La Société des Missions Etrangères | Vicar Apostolic of Cochin {Cocincina}, Viet Nam |
| 24.0 | Ordained Priest | Francesco Pio Santi † | Priest | Bishop of Sovana (Soana), Italy |
| Born | Thomas Scallan, O.F.M. † | Wexford, Ireland | Vicar Apostolic of Newfoundland, Canada |
| 23.1 | Ordained Priest | Nicolás Videla del Pino † | Priest | Bishop of Salta, Argentina |
| 6 Jan | 69.0 | Died | Giovanbattista Caracciolo, C.R. † | Bishop of Aversa, Italy |
| 9 Jan | 72.1 | Died | Filippo Niccolò Cecina † | Coadjutor Bishop of Volterra, Italy |
| 13 Jan | 22.9 | Ordained Priest | Michael Léopold Brigido von Marenfels und Bresoviz † | Priest of Seckau, Austria | Bishop of Spiš, Slovakia |
| Born | Jean-François de Saunhac-Belcastel † | Amplac | Bishop of Perpignan-Elne, France |
| 18 Jan | | Born | Gaetano Barbaroli † | Sarno | Bishop of Policastro, Italy |
| 61.3 | Died | Juan Francisco Manrique Lara † | Bishop of Plasencia, Spain |
| 21 Jan | | Born | Vincenzo Rocca † | Cercemaggiore | Bishop of Larino, Italy |
| 25 Jan | 77.3 | Died | Luca Niccolò Recco † | Bishop of Ripatransone, Italy |
| 27 Jan | 40.1 | Ordained Bishop | Charles-Joseph de Raffélis de Saint-Sauveur † | Bishop of Tulle, France |
| 30 Jan | | Born | Emmanuele Custo † | Palermo | Bishop of Mazara del Vallo, Italy |
| 2 Feb | | Born | Francisco Ferreira de Azevedo † | Bahia | Bishop of Goiás, Brazil |
| 3 Feb | 58.9 | Ordained Bishop | Pio Manzador, B. † | Bishop of Senj (-Modruš), Croatia | Bishop of Transilvania, Erdély, Siebenbürgen, Romania |
| 4 Feb | 39.4 | Appointed | Guido Calcagnini † | Titular Archbishop of Tarsus | Cardinal, Bishop of Osimo e Cingoli, Italy |
| 39.7 | Appointed | Ange-François de Talaru de Chalmazel † | Bishop of Coutances, France |
| 56.8 | Appointed | Filippo Maria Pirelli † | Titular Archbishop of Damascus | Cardinal, Cardinal-Priest of San Crisogono |
| 48.5 | Appointed | Tommaso Taglialatela † | Bishop of Sora, Italy |
| 45.5 | Appointed | Francisco Fabián y Fuero † | Bishop of Tlaxcala, México | Archbishop Emeritus of Valencia, Spain |
| 10 Feb | 39.4 | Ordained Bishop | Guido Calcagnini † | Titular Archbishop of Tarsus | Cardinal, Bishop of Osimo e Cingoli, Italy |
| 56.8 | Ordained Bishop | Filippo Maria Pirelli † | Titular Archbishop of Damascus | Cardinal, Cardinal-Priest of San Crisogono |
| 48.5 | Ordained Bishop | Tommaso Taglialatela † | Bishop of Sora, Italy |
| 13 Feb | | Born | Francisco Ramón Valentín de Casaus y Torres, O.P. † | Jaca, Spain | Archbishop of Guatemala |
| 14 Feb | 69.7 | Died | Didacus Manola † | Bishop of Trogir (Traù), Croatia |
| 17 Feb | 67.9 | Ordained Bishop | Pietro Paolo Carta † | Bishop of Ampurias e Civita, Italy |
| 21 Feb | | Born | Antonio Maria Traversi † | Venetia | Titular Patriarch of Constantinople |
| 27 Feb | 60.9 | Died | Sebastiano Bonaiuti † | Bishop of Montefeltro, Italy |
| 2 Mar | 25.0 | Ordained Priest | Vincenzo Ferretti † | Priest | Bishop of Rimini, Italy |
| 22.2 | Ordained Priest | Francisco Leitão de Carvalho, O. Cist. † | Priest of Order of Cistercians | Bishop of Beja, Portugal |
| 71.8 | Died | Christian Albert Anton von Merle † | Auxiliary Bishop of Worms, Germany |
| 24.2 | Ordained Priest | Petrus Alexander Samson Toczylowski † | Priest | Auxiliary Bishop of Vilnius, Lithuania |
| 3 Mar | 24.4 | Ordained Priest | Ferdinand Kindermann † | Priest of Praha {Prague}, Czech Republic | Bishop of Litoměřice, Czech Republic |
| 7 Mar | | Born | Pietro Consiglio † | Bisceglie | Archbishop of Brindisi, Italy |
| 9 Mar | 53.2 | Died | Giorgio Uladagni † | Bishop of Sapë, Albania |
| 10 Mar | 39.8 | Ordained Bishop | Ange-François de Talaru de Chalmazel † | Bishop of Coutances, France |
| 17 Mar | 22.4 | Ordained Priest | Gabriel Zerdahely † | Priest | Bishop of Banská Bystrica, Slovakia |
| 23 Mar | 27.2 | Ordained Priest | Martinus Cordella † | Priest | Bishop of Bagnoregio (Bagnorea), Italy |
| 25.1 | Ordained Priest | Maciej Grzegorz Garnysz † | Priest | Bishop of Chełm, Poland |
| 27.9 | Ordained Priest | Salvator Giuseppe Mammeli † | Priest | Bishop-Elect of Alghero, Italy |
| 80.8 | Died | Juan Francisco Navarro Salvador y Gilabert † | Bishop of Albarracin, Spain |
| 23.0 | Ordained Priest | Benedetto Solari, O.P. † | Priest of Order of Friars Preachers | Bishop of Noli, Italy |
| 27 Mar | 33.1 | Confirmed | Jean-de-Dieu-Raymond de Boisgelin de Cucè † | Bishop of Lavaur, France | Cardinal, Archbishop of Tours, France |
| 64.9 | Appointed | Niccolò Borgia † | Bishop of Aversa, Italy |
| 53.6 | Appointed | Severino Maria (Giuseppe) Castelli, O.S.B. † | Titular Bishop of Numida |
| 56.2 | Appointed | Deodatus de Chaumont de Mareuil † | Titular Bishop of Sion |
| Installed | Juan Carlos de Vilches y Cabrera † | Bishop of Nicaragua |
| 35.7 | Appointed | Manuel Ferrer y Figueredo † | Titular Archbishop of Edessa in Osrhoëne | Bishop of Málaga, Spain |
| 25.5 | Confirmed | Klemens Wenzeslaus von Sachsen † | Coadjutor Bishop of Augsburg, Germany | Bishop |
| 31 Mar | | Born | Domenico Genovesi † | Roma, Italy | Titular Archbishop of Mitylene |
| 61.2 | Died | Gerardus Giannettasio † | Bishop of Lavello, Italy |
| Apr | 68.6 | Died | Antonius Nani † | Archbishop of Corfù, Greece |
| 5 Apr | 62.3 | Died | Cornelio Caprara † | Cardinal, Cardinal-Deacon of Santi Cosma e Damiano |
| Born | Ignacy Wincenty Stanislaw Mathy (Matthy) † | Kobierzyn | Bishop of Chelmno (Culma, Kulm), Poland |
| 6 Apr | 22.9 | Ordained Priest | Giuseppe Maria Bressa, O.S.B. † | Priest of Order of Saint Benedict | Bishop of Concordia (Sagittaria), Italy |
| 10 Apr | 33.2 | Ordained Priest | Alessandro Maria Odoardi † | Priest | Bishop of Perugia, Italy |
| 14 Apr | 69.9 | Resigned | Giuseppe Gallarati † | Bishop of Lodi, Italy | Bishop Emeritus |
| 24.7 | Ordained Priest | Francesco Saverio Gualtieri † | Priest | Bishop of Caserta, Italy |
| 20 Apr | 58.3 | Died | Prospero Colonna di Sciarra † | Cardinal, Cardinal-Deacon of Sant’Agata de’ Goti |
| 21 Apr | 59.3 | Ordained Bishop | Juan Luengo Pinto † | Bishop of Calahorra y La Calzada, Spain |
| Born | Augustin-Sulpice Zen-Ruffinen † | Leuk | Bishop of Sion {Sitten}, Switzerland |
| 22 Apr | 54.3 | Appointed | Miguel Anselmo Álvarez de Abreu y Valdéz † | Bishop of Antequera, Oaxaca, México |
| 60.2 | Appointed | Salvatore Andreani, B. † | Bishop of Lodi, Italy |
| 57.3 | Appointed | Miguel Cilieza y Velasco † | Auxiliary Bishop of Guatemala (Santiago de Guatemala), Guatemala | Bishop of Chiapas (Ciudad Real de Chiapas), México |
| 57.3 | Appointed | Miguel Cilieza y Velasco † | Titular Bishop of Adramyttium | Bishop of Chiapas (Ciudad Real de Chiapas), México |
| 35.2 | Appointed | Jan Stefan Giedroyc † | Bishop of Inflanty (Livonia)-Pilten, Poland | Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania |
| 33.3 | Appointed | Franciszek Kandyd Ossolinski, O.F.M. Conv. † | Coadjutor Bishop of Bacău, Romania | Bishop of Kyiv and Chernihiv (Kijów and Czernihow), Ukraine |
| 33.3 | Appointed | Franciszek Kandyd Ossolinski, O.F.M. Conv. † | Titular Bishop of Dardanus | Bishop of Kyiv and Chernihiv (Kijów and Czernihow), Ukraine |
| 55.3 | Appointed | Giovanni Pergolini † | Bishop of Montefeltro, Italy | Bishop of Urbania-Sant’Angelo in Vado, Italy |
| 43.2 | Appointed | Atanasie Rednic, O.S.B.M. † | Bishop of Făgăraş (Romanian), Romania |
| 54.1 | Appointed | Franz Anton Xaver von Scheben † | Auxiliary Bishop of Worms, Germany |
| 54.1 | Appointed | Franz Anton Xaver von Scheben † | Titular Bishop of Assuras | Auxiliary Bishop of Worms, Germany |
| 65.3 | Appointed | Manuel Sosa Betencourt † | Bishop of Santafé en Nueva Granada, Colombia |
| 67.5 | Appointed | Luigi Maria Torreggiani † | Cardinal, Cardinal-Deacon of Sant’Agata de’ Goti |
| 36.3 | Appointed | Feliks Paweł Turski † | Bishop of Chełm, Poland | Bishop of Kraków, Poland |
| 45.3 | Appointed | Bernardo Velarde Velarde † | Bishop of Tortosa, Spain | Archbishop of Zaragoza, Spain |
| 60.2 | Appointed | Walenty Franciszek Wężyk † | Bishop of Przemyśl, Poland |
| 45.1 | Appointed | Karl Friedrich von Zehmen † | Auxiliary Bishop of Warmia (Ermland), Poland |
| 45.1 | Appointed | Karl Friedrich von Zehmen † | Titular Bishop of Lete | Auxiliary Bishop of Warmia (Ermland), Poland |
| 27 Apr | 65.4 | Died | Tommaso Galli † | Bishop of Tivoli, Italy |
| 28 Apr | 33.2 | Ordained Bishop | Jean-de-Dieu-Raymond de Boisgelin de Cucè † | Bishop of Lavaur, France | Cardinal, Archbishop of Tours, France |
| May | 58.2 | Died | Giuseppi Maria Massoni † | Bishop of Sagone (Sagona), France |
| 1 May | 60.2 | Ordained Bishop | Salvatore Andreani, B. † | Bishop of Lodi, Italy |
| 53.7 | Ordained Bishop | Severino Maria (Giuseppe) Castelli, O.S.B. † | Titular Bishop of Numida |
| 68.2 | Died | Bonifatius (Giovanni Giuseppe) Cecotti, O.F.M. † | Bishop of Pedena, Austria |
| 55.3 | Ordained Bishop | Giovanni Pergolini † | Bishop of Montefeltro, Italy | Bishop of Urbania-Sant’Angelo in Vado, Italy |
| 9 May | | Born | Denis-Antoine-Luc de Frayssinous † | Curières, France | Titular Bishop of Hermopolis Maior |
| 12 May | 70.0 | Died | Biagio Chiarelli † | Bishop of Ravello e Scala, Italy |
| 16 May | | Born | Giovanni Antonio Benvenuti † | Belvedere | Cardinal, Bishop of Osimo e Cingoli, Italy |
| 45.4 | Selected | Michael Peter MacMahon (McMahon), O.P. † | Bishop of Killaloe, Ireland |
| Died | William O’Meara † | Bishop of Killaloe, Ireland |
| 26 May | 54.2 | Ordained Bishop | Franz Anton Xaver von Scheben † | Titular Bishop of Assuras | Auxiliary Bishop of Worms, Germany |
| 28 May | | Born | Antonio Fernando Echanove Zaldívar † | Ochandiano | Archbishop of Tarragona, Spain |
| 31 May | 78.7 | Resigned | Sante Lanucci † | Bishop of Civita Castellana e Orte, Italy | Bishop Emeritus |
| Jun | 26.7 | Ordained Priest | Ignatius Darabanth, O.S.B.M. † | Priest of Basilian Order of Saint Josaphat (Order of St. Basil the Great) | Bishop of Oradea Mare {Gran Varadino} (Romanian), Romania |
| 1 Jun | 24.1 | Ordained Priest | Saverio Granata, C.R. † | Priest of Congregation of Clerics Regular | Bishop of Agrigento (Girgenti), Italy |
| 23.2 | Ordained Priest | Giuseppe Marra † | Priest | Bishop of Nicotera, Italy |
| 59.7 | Resigned | Manuel Murillo Argáiz † | Bishop of Segovia, Spain | Bishop Emeritus |
| 38.5 | Ordained Priest | Franz Joseph Sigismund von Roggenbach † | Priest of Basel, Switzerland | Bishop |
| 3 Jun | 80.4 | Resigned | Aleksander Kazimierz Horain † | Auxiliary Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania | Auxiliary Bishop Emeritus |
| Born | Joseph-Julien de Saint-Rome-Gualy † | Millau | Bishop of Carcassonne, France |
| 5 Jun | 49.1 | Appointed | Bartolomeo Bitozzi † | Bishop of Ripatransone, Italy |
| 55.3 | Appointed | Francesco Maria Forlani † | Bishop of Civita Castellana e Orte, Italy |
| 43.0 | Appointed | Joannes Lucas Garagnin † | Archbishop of Split (Spalato), Croatia |
| 54.4 | Appointed | José Cayetano Loazes Somoza † | Bishop of Palencia, Spain |
| 42.7 | Appointed | Francisco Antonio de Lorenzana y Butrón † | Bishop of Plasencia, Spain | Cardinal, Archbishop Emeritus of Toledo, Spain |
| 61.3 | Appointed | Juan José Martínez Escalzo † | Bishop of Segovia, Spain |
| 45.4 | Confirmed | Michael Peter MacMahon (McMahon), O.P. † | Bishop of Killaloe, Ireland |
| 62.5 | Appointed | Giulio Matteo Natali † | Bishop of Tivoli, Italy |
| 54.6 | Appointed | Andrea Negroni † | Cardinal-Deacon of Santi Vito, Modesto e Crescenzia | Cardinal, Cardinal-Deacon of Sant’Agata de’ Goti |
| 6 Jun | | Born | Francesco Maria Zoppi † | Cannobio | Bishop Emeritus of Massa Carrara, Italy |
| 11 Jun | | Born | José Casquete Prado, O.S. † | Fuente de Cantos, Spain | Titular Bishop of Cisamus |
| 12 Jun | | Born | Giovanni Battista Accusani † | Acqui | Bishop of Vigevano, Italy |
| 16 Jun | 36.4 | Ordained Bishop | Feliks Paweł Turski † | Bishop of Chełm, Poland | Bishop of Kraków, Poland |
| 18 Jun | 54.7 | Died | Ferenc Barkóczy de Szala † | Archbishop of Esztergom, Hungary |
| 24 Jun | 57.5 | Ordained Bishop | Miguel Cilieza y Velasco † | Titular Bishop of Adramyttium | Bishop of Chiapas (Ciudad Real de Chiapas), México |
| 80.5 | Died | Francisco José de Figueredo y Victoria † | Archbishop of Guatemala |
| 25 Jun | 61.2 | Resigned | Girolamo Palermo, C.R. † | Bishop of Mazara del Vallo, Italy | Bishop Emeritus |
| 28 Jun | 55.3 | Died | Marcello Capano Orsini † | Archbishop of Conza, Italy |