| Date | Age | Event | Bishop | Title | Current Title |
| 1 Apr | 44.3 | Died | [Joseph Perbost] † | Bishop |
| 2 Apr | | Born | José Miguel Arístegui Aróstegui † | | Auxiliary Bishop of Santiago de Chile |
| 58.3 | Died | Luigi Pianazzi, O.C.D. † | Vicar Apostolic of Malabar, India |
| 3 Apr | 22.8 | Ordained Priest | Giovanni Domenico (Biagio) Stefanelli, O.P. † | Priest of Order of Friars Preachers | Archbishop Emeritus of Lucca, Italy |
| 4 Apr | 45.3 | Ordained Bishop | Tommaso Maria Raimondo Leopoldo Arezzo † | Titular Archbishop of Seleucia in Isauria | Cardinal, Cardinal-Bishop of Sabina |
| 54.1 | Ordained Bishop | Antonio Bergosa y Jordán † | Bishop of Antequera, Oaxaca, México | Archbishop of Tarragona, Spain |
| 61.4 | Ordained Bishop | Carlo Francesco Maria Caselli, O.S.M. † | Titular Archbishop of Side | Cardinal, Bishop of Parma, Italy |
| 54.7 | Died | Henri-Charles du Lau d’Allemans † | Bishop of Grenoble, France |
| 44.0 | Ordained Bishop | Giuseppe Morozzo Della Rocca † | Titular Archbishop of Thebae | Cardinal, Bishop of Novara, Italy |
| 6 Apr | | Born | Joannes van Breugel † | | Coadjutor Vicar Apostolic of Breda, Netherlands |
| Born | Angelo Fusinato † | | Bishop of Concordia (Sagittaria), Italy |
| 7 Apr | | Born | James Gillis † | | Vicar Apostolic of Eastern District, Scotland, Great Britain |
| 24.1 | Ordained Priest | Angelo-Andrea Zottoli † | Priest | Auxiliary Bishop of Salerno (-Acerno), Italy |
| 9 Apr | | Born | Jean-Antoine-Auguste Bélaval † | | Bishop of Pamiers, France |
| 92.5 | Selected | Jean-Baptiste de Belloy-Morangle † | Cardinal, Archbishop of Paris, France |
| 39.4 | Selected | Etienne-Alexandre-Jean-Baptiste-Marie Bernier † | Bishop of Orléans, France |
| 71.1 | Selected | Jean-Baptiste Bourlier † | Bishop of Évreux, France |
| 49.6 | Selected | Charles Brault † | Bishop of Bayeux, France | Archbishop of Albi, France |
| 45.5 | Selected | Etienne-Hubert de Cambacérès † | Cardinal, Archbishop of Rouen, France |
| 66.5 | Selected | Jérôme-Marie Champion de Cicé † | Archbishop of Aix, France |
| 63.8 | Selected | Louis Charrier de La Roche † | Bishop of Versailles, France |
| 55.8 | Selected | Hilarion-François de Chevigné de Boischollet † | Bishop of Sées {Séez}, France |
| 52.7 | Selected | Dominique Lacombe † | Bishop of Angoulême, France |
| 61.2 | Selected | Claude Le Coz † | Archbishop of Besançon, France |
| 48.8 | Selected | Jean-Claude Leblanc de Beaulieu † | Bishop of Soissons, France | Archbishop Emeritus of Arles, France |
| 80.5 | Selected | Gabriel-François Moreau † | Bishop of Autun, France |
| 45.6 | Selected | Antoine-Xavier Maynaud de Pancemont † | Bishop of Vannes, France |
| 61.8 | Selected | Jean-François Périer † | Bishop of Avignon, France | Bishop Emeritus |
| 54.7 | Selected | Claude-François-Marie Primat, C.O. † | Archbishop of Toulouse, France |
| 66.4 | Selected | Claude-Louis Rousseau † | Bishop of Coutances, France | Bishop of Orléans, France |
| 69.0 | Selected | Jean-Pierre Saurine † | Bishop of Strasbourg, France |
| 10 Apr | 65.4 | Died | Gregorio Bandi † | Titular Archbishop of Edessa in Osrhoëne |
| 92.5 | Confirmed | Jean-Baptiste de Belloy-Morangle † | Cardinal, Archbishop of Paris, France |
| 39.4 | Confirmed | Etienne-Alexandre-Jean-Baptiste-Marie Bernier † | Bishop of Orléans, France |
| 45.5 | Confirmed | Etienne-Hubert de Cambacérès † | Cardinal, Archbishop of Rouen, France |
| 66.6 | Confirmed | Jérôme-Marie Champion de Cicé † | Archbishop of Aix, France |
| 43.6 | Selected | Jean-Baptiste Colonna d’Istria † | Bishop of Nice, France | Bishop Emeritus |
| 45.6 | Confirmed | Antoine-Xavier Maynaud de Pancemont † | Bishop of Vannes, France |
| 57.0 | Selected | Louis Sébastiani de La Porta † | Bishop of Ajaccio, France |
| 11 Apr | 81.2 | Died | Gabriel Álvarez de Faria y Sánchez Zarzosa † | Bishop of Badajoz, Spain |
| 39.4 | Ordained Bishop | Etienne-Alexandre-Jean-Baptiste-Marie Bernier † | Bishop of Orléans, France |
| 64.4 | Selected | Pierre-François Bienaymé † | Bishop of Metz, France |
| 45.5 | Ordained Bishop | Etienne-Hubert de Cambacérès † | Cardinal, Archbishop of Rouen, France |
| 52.0 | Selected | Etienne-André-François de Paule de Fallot de Béaupré de Beaumont † | Bishop of Gent {Ghent, Gand}, Belgium | Bishop Emeritus of Vaison, France |
| 78.0 | Appointed | Marc-Antoine de Noé † | Bishop of Troyes, France |
| 45.6 | Ordained Bishop | Antoine-Xavier Maynaud de Pancemont † | Bishop of Vannes, France |
| 64.4 | Selected | Henri Reymond † | Bishop of Dijon, France |
| 12 Apr | 55.9 | Selected | Louis-Mathias-Joseph de Barral † | Bishop of Meaux, France | Archbishop Emeritus of Tours, France |
| 81.1 | Selected | Jean-Armand de Bessuéjouls Roquelaure † | Archbishop of Mechelen, Belgium | Archbishop Emeritus |
| 70.1 | Selected | Jean-de-Dieu-Raymond de Boisgelin de Cucé † | Cardinal, Archbishop of Tours, France |
| 39.0 | Selected | Jean-Baptiste-Marie Caffarelli † | Bishop of Saint-Brieuc, France |
| 75.2 | Selected | Michel-François de Couët du Vivier de Lorry † | Bishop of La Rochelle, France | Bishop Emeritus |
| 65.6 | Selected | Charles-François d’Aviau Du Bois-de-Sanzay † | Archbishop of Bordeaux, France |
| 22.1 | Ordained Deacon | Kazimierz Roch Dmochowski † | Deacon | Archbishop of Mohilev, Belarus |
| 55.6 | Selected | Charles-Antoine-Henri Du Valk de Dampierre † | Bishop of Clermont, France |
| 58.3 | Selected | Jean-Baptiste-Marie de Maillé de la Tour-Landry † | Bishop of Rennes, France |
| 66.1 | Selected | Marie-Charles-Isidore de Mercy † | Archbishop of Bourges, France |
| 46.9 | Selected | Charles Montault des Isles † | Bishop of Angers, France |
| 59.7 | Selected | René des Monstiers de Mérinville † | Bishop of Chambéry, France | Bishop Emeritus |
| 48.1 | Selected | Antoine-Eustache d’Osmond † | Bishop of Nancy, France |
| 13 Apr | 74.5 | Died | Francesco Mantica † | Cardinal, Cardinal-Priest of Santa Prisca |
| 14 Apr | 55.9 | Confirmed | Louis-Mathias-Joseph de Barral † | Bishop of Meaux, France | Archbishop Emeritus of Tours, France |
| 81.1 | Confirmed | Jean-Armand de Bessuéjouls Roquelaure † | Archbishop of Mechelen, Belgium | Archbishop Emeritus |
| 62.1 | Selected | Jean-Baptiste de Chabot † | Bishop of Mende, France | Bishop Emeritus |
| 55.6 | Confirmed | Charles-Antoine-Henri Du Valk de Dampierre † | Bishop of Clermont, France |
| 46.9 | Confirmed | Charles Montault des Isles † | Bishop of Angers, France |
| 66.4 | Confirmed | Claude-Louis Rousseau † | Bishop of Coutances, France | Bishop of Orléans, France |
| 15 Apr | 73.1 | Died | Gregorio Alessandri † | Bishop of Cortona, Italy |
| 66.1 | Confirmed | Marie-Charles-Isidore de Mercy † | Archbishop of Bourges, France |
| 48.1 | Confirmed | Antoine-Eustache d’Osmond † | Bishop of Nancy, France |
| 16 Apr | 70.1 | Confirmed | Jean-de-Dieu-Raymond de Boisgelin de Cucé † | Cardinal, Archbishop of Tours, France |
| Born | Sebastião Pinto do Rêgo † | | Bishop of São Paulo, Brazil |
| 17 Apr | 44.6 | Selected | Louis Belmas † | Bishop of Cambrai, France |
| 71.2 | Confirmed | Jean-Baptiste Bourlier † | Bishop of Évreux, France |
| 75.2 | Confirmed | Michel-François de Couët du Vivier de Lorry † | Bishop of La Rochelle, France | Bishop Emeritus |
| 20 Apr | 51.4 | Died | Emidio Ziucci † | Titular Archbishop of Damascus |
| 21 Apr | 58.8 | Selected | Claude André † | Bishop of Quimper, France | Bishop Emeritus |
| 23 Apr | 71.2 | Ordained Bishop | Jean-Baptiste Bourlier † | Bishop of Évreux, France |
| 24 Apr | | Born | José de Viteri y Ungo † | | Bishop of Nicaragua |
| 58.3 | Confirmed | Jean-Baptiste-Marie de Maillé de la Tour-Landry † | Bishop of Rennes, France |
| 25 Apr | 48.9 | Confirmed | Jean-Claude Leblanc de Beaulieu † | Bishop of Soissons, France | Archbishop Emeritus of Arles, France |
| 66.4 | Ordained Bishop | Claude-Louis Rousseau † | Bishop of Coutances, France | Bishop of Orléans, France |
| 29 Apr | 58.9 | Confirmed | Claude André † | Bishop of Quimper, France | Bishop Emeritus |
| 39.0 | Confirmed | Jean-Baptiste-Marie Caffarelli † | Bishop of Saint-Brieuc, France |
| 33.7 | Selected | Hugues-Robert-Jean-Charles de la Tour d’Auvergne-Lauraquais † | Cardinal, Bishop of Arras, France |
| 61.3 | Confirmed | Claude Le Coz † | Archbishop of Besançon, France |
| 54.7 | Confirmed | Claude-François-Marie Primat, C.O. † | Archbishop of Toulouse, France |
| 69.1 | Confirmed | Jean-Pierre Saurine † | Bishop of Strasbourg, France |
| 57.9 | Selected | Irénée-Yves Desolle (Dessole) † | Bishop of Digne, France | Archbishop Emeritus of Chambéry, France |
| 65.4 | Selected | Jean-Évangéliste Zäpfel (Zaepfell) † | Bishop of Liège, Belgium |
| 30 Apr | 44.7 | Confirmed | Louis Belmas † | Bishop of Cambrai, France |
| 52.7 | Confirmed | Dominique Lacombe † | Bishop of Angoulême, France |
| 61.8 | Confirmed | Jean-François Périer † | Bishop of Avignon, France | Bishop Emeritus |
| 63.2 | Selected | Jean-Chrysostome André de Villaret † | Bishop of Amiens, France | Bishop Emeritus of Casale Monferrato, Italy |
| 1 May | 39.0 | Ordained Bishop | Jean-Baptiste-Marie Caffarelli † | Bishop of Saint-Brieuc, France |
| 62.1 | Confirmed | Jean-Baptiste de Chabot † | Bishop of Mende, France | Bishop Emeritus |
| Born | Carlo Gigli † | | Bishop Emeritus of Tivoli, Italy |
| 70.9 | Ordained Bishop | Giuseppe Guzzetta † | Titular Bishop of Lampsacus |
| 2 May | 54.1 | Installed | Antonio Bergosa y Jordán † | Bishop of Antequera, Oaxaca, México | Archbishop of Tarragona, Spain |
| 55.7 | Ordained Bishop | Charles-Antoine-Henri Du Valk de Dampierre † | Bishop of Clermont, France |
| Born | Vincent Etienne Jekelfalussy † | | Bishop of Székesfehérvár (Albareale), Hungary |
| 64.4 | Confirmed | Henri Reymond † | Bishop of Dijon, France |
| 4 May | 64.5 | Confirmed | Pierre-François Bienaymé † | Bishop of Metz, France |
| 49.7 | Confirmed | Charles Brault † | Bishop of Bayeux, France | Archbishop of Albi, France |
| 59.8 | Confirmed | René des Monstiers de Mérinville † | Bishop of Chambéry, France | Bishop Emeritus |
| 41.0 | Selected | Ignace Michel Zahir (Daher) † | Patriarch of Antiochia {Antioch} (Syrian), Lebanon | Patriarch Emeritus |
| 41.0 | Selected | Ignace Michel Zahir (Daher) † | Bishop of Beirut {Bairut} (Syrian), Lebanon | Patriarch Emeritus of Antiochia {Antioch} (Syrian), Lebanon |
| 6 May | 33.7 | Confirmed | Hugues-Robert-Jean-Charles de la Tour d’Auvergne-Lauraquais † | Cardinal, Bishop of Arras, France |
| 7 May | | Born | Michele Adinolfi † | | Bishop of Nocera de’ Pagani, Italy |
| 81.4 | Resigned | Henri-Joseph-Claude de Bourdeilles † | Bishop of Soissons, France | Bishop Emeritus |
| 8 May | 59.4 | Selected | Francisco Leitão de Carvalho, O. Cist. † | Bishop of Beja, Portugal |
| 9 May | 58.9 | Ordained Bishop | Claude André † | Bishop of Quimper, France | Bishop Emeritus |
| 64.5 | Ordained Bishop | Pierre-François Bienaymé † | Bishop of Metz, France |
| 63.9 | Confirmed | Louis Charrier de La Roche † | Bishop of Versailles, France |
| 67.4 | Selected | Johann Michael Josef von Pidoll de Quitenbach † | Bishop of Le Mans, France |
| 11 May | | Born | Giuseppe Andrea Bizzarri † | | Cardinal, Prefect of the Roman Curia - Other |
| 55.9 | Confirmed | Hilarion-François de Chevigné de Boischollet † | Bishop of Sées {Séez}, France |
| 44.1 | Appointed | Giuseppe Morozzo Della Rocca † | Apostolic Nuncio to Florence (Tuscany), Italy | Cardinal, Bishop of Novara, Italy |
| 12 May | | Born | Nicolas-Marie Sergent † | | Bishop of Quimper [Cornouailles](-Léon), France |
| 13 May | 47.8 | Succeeded | Józef Arnulf Giedroyć † | Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania |
| 72.2 | Died | Jan Stefan Giedroyć † | Bishop of Žemaičiai (Samogizia o Tels; Żmudź), Lithuania |
| 14 May | | Born | Carlo Caccia Dominioni † | | Auxiliary Bishop of Milano {Milan}, Italy |
| 42.3 | Appointed | Peter McLaughlin † | Bishop of Raphoe, Ireland | Bishop of Derry, Ireland |
| 15 May | 52.1 | Confirmed | Etienne-André-François de Paule de Fallot de Béaupré de Beaumont † | Bishop of Gent {Ghent, Gand}, Belgium | Bishop Emeritus of Vaison, France |
| 63.3 | Confirmed | Jean-Chrysostome André de Villaret † | Bishop of Amiens, France | Bishop Emeritus of Casale Monferrato, Italy |
| 16 May | 49.7 | Ordained Bishop | Charles Brault † | Bishop of Bayeux, France | Archbishop of Albi, France |
| 55.9 | Ordained Bishop | Hilarion-François de Chevigné de Boischollet † | Bishop of Sées {Séez}, France |
| Born | Juan Nepomuceno Garcia Gómez † | | Bishop of Coria, Spain |
| 33.7 | Ordained Bishop | Hugues-Robert-Jean-Charles de la Tour d’Auvergne-Lauraquais † | Cardinal, Bishop of Arras, France |
| 80.6 | Confirmed | Gabriel-François Moreau † | Bishop of Autun, France |
| 41.0 | Ordained Bishop | Ignace Michel Zahir (Daher) † | Patriarch of Antiochia {Antioch} (Syrian), Lebanon | Patriarch Emeritus |
| 18 May | 65.9 | Selected | Claude Leopoldo de Bexon † | Bishop of Namur {Namen}, Belgium | Bishop Emeritus |
| 20 May | 50.7 | Selected | Marie-Jean-Philippe Dubourg † | Bishop of Limoges, France |
| 22 May | 70.1 | Died | Jean-Antoine de Castellane Saint-Mauris † | Bishop Emeritus of Lavaur, France |
| 23 May | 58.5 | Ordained Bishop | Manuel Cid Monroy † | Archbishop of Burgos, Spain |
| 58.6 | Ordained Bishop | Manuel Gómez de Salazar † | Bishop of Ávila, Spain |
| 53.4 | Died | Gregory Stapleton † | Vicar Apostolic of Midland District, England, Great Britain |
| 63.3 | Ordained Bishop | Jean-Chrysostome André de Villaret † | Bishop of Amiens, France | Bishop Emeritus of Casale Monferrato, Italy |
| 24 May | 48.0 | Appointed | Francesco Bertazzoli † | Secret Almoner of the Office of Papal Charities | Cardinal, Prefect of the Congregation for Studies |
| 48.0 | Appointed | Francesco Bertazzoli † | Titular Archbishop of Edessa in Osrhoëne | Cardinal, Prefect of the Congregation for Studies |
| 73.9 | Appointed | Gaetano Maria Bonanno † | Bishop of Siracusa, Italy |
| 53.7 | Confirmed | Luiz de Brito Homem † | Bishop of São Luís do Maranhão, Brazil |
| 68.9 | Appointed | Giovanni Battista Caprara Montecuccoli † | Cardinal, Archbishop of Milano {Milan}, Italy |
| 43.7 | Confirmed | Jean-Baptiste Colonna d’Istria † | Bishop of Nice, France | Bishop Emeritus |
| 66.0 | Appointed | Carlo Crivelli † | Cardinal, Cardinal-Priest of Santa Susanna |
| 52.4 | Appointed | Francisco Javier de Lizana y Beaumont † | Archbishop of México, Federal District |
| 68.8 | Appointed | Ludovico Flangini Giovanelli † | Cardinal-Priest of Sant’Anastasia | Cardinal, Patriarch of Venezia {Venice}, Italy |
| 54.2 | Appointed | Francisco Javier Mier y Campillo † | Bishop of Almería, Spain | Bishop Emeritus |
| 68.4 | Appointed | Giovanni Vincenzo Monforte † | Archbishop of Napoli {Naples}, Italy |
| Born | François-Alexis Rameaux, C.M. † | | Vicar Apostolic of Chekiang {Ce-Kiam} and Kiangsi, China |
| 74.6 | Died | Jean-Marc de Royére † | Bishop Emeritus of Castres, France |
| 57.0 | Confirmed | Sylvestre a Maria Santissima (Santa Maria), O.F.M. Disc. † | Bishop of Santiago de Cabo Verde |
| 46.2 | Appointed | Giuseppe Maria Spina † | Archbishop of Genova, Italy | Cardinal, Archbishop Emeritus |
| 46.2 | Appointed | Giuseppe Maria Spina † | Cardinal-Priest of Sant’Agnese fuori le mura | Cardinal, Archbishop Emeritus of Genova, Italy |
| 59.6 | Appointed | Mercurio Maria Teresi † | Archbishop of Monreale, Italy |
| 72.5 | Confirmed | Cayetano Velozo, O.F.M. Ref. † | Bishop of São Tomé e Príncipe |
| 25 May | 65.9 | Confirmed | Claude Leopoldo de Bexon † | Bishop of Namur {Namen}, Belgium | Bishop Emeritus |
| 67.5 | Confirmed | Johann Michael Josef von Pidoll de Quitenbach † | Bishop of Le Mans, France |
| 27 May | 64.0 | Installed | Louis Charrier de La Roche † | Bishop of Versailles, France |
| 30 May | 61.7 | Appointed | Marc-Antoine Berdolet † | Bishop of Aachen, Germany |
| 48.0 | Ordained Bishop | Francesco Bertazzoli † | Titular Archbishop of Edessa in Osrhoëne | Cardinal, Prefect of the Congregation for Studies |
| 65.9 | Ordained Bishop | Claude Leopoldo de Bexon † | Bishop of Namur {Namen}, Belgium | Bishop Emeritus |
| 71.6 | Ordained Bishop | Juan Antonio Pérez Hernández de Larrea † | Bishop of Valladolid, Spain |
| 1 Jun | 50.7 | Confirmed | Marie-Jean-Philippe Dubourg † | Bishop of Limoges, France |
| 2 Jun | 65.8 | Confirmed | Charles-François d’Aviau Du Bois-de-Sanzay † | Archbishop of Bordeaux, France |
| 3 Jun | 69.3 | Died | Joseph Adam Arco † | Bishop of Seckau, Austria |
| 65.5 | Confirmed | Jean-Évangéliste Zäpfel (Zaepfell) † | Bishop of Liège, Belgium |
| 5 Jun | 33.8 | Installed | Hugues-Robert-Jean-Charles de la Tour d’Auvergne-Lauraquais † | Cardinal, Bishop of Arras, France |
| 7 Jun | 65.5 | Ordained Bishop | Jean-Évangéliste Zäpfel (Zaepfell) † | Bishop of Liège, Belgium |
| 12 Jun | 26.7 | Ordained Priest | Michele Bombini † | Priest | Bishop of Cassano all’Jonio, Italy |
| 31.4 | Ordained Priest | Antonio José Ferreira de Sousa † | Priest | Auxiliary Bishop of Lisboa {Lisbon}, Portugal |
| 23.2 | Ordained Priest | Ippolito Niccolai † | Priest | Bishop of Montepulciano, Italy |
| 13 Jun | 59.6 | Ordained Bishop | Mercurio Maria Teresi † | Archbishop of Monreale, Italy |
| 15 Jun | 65.5 | Died | Gabriel Konaider † | Bishop of Alep [Beroea, Halab] (Maronite), Syria |
| 68.4 | Died | Giovanni Vincenzo Monforte † | Archbishop of Napoli {Naples}, Italy |
| 16 Jun | 57.2 | Confirmed | Louis Sébastiani de La Porta † | Bishop of Ajaccio, France |
| 17 Jun | 50.8 | Ordained Bishop | Marie-Jean-Philippe Dubourg † | Bishop of Limoges, France |
| 20 Jun | 74.0 | Ordained Bishop | Gaetano Maria Bonanno † | Bishop of Siracusa, Italy |
| 52.9 | Installed | Dominique Lacombe † | Bishop of Angoulême, France |
| 23.0 | Ordained Priest | Joseph Karl von Schuberth † | Priest of Wrocław (Breslau), Poland | Auxiliary Bishop |
| 24 Jun | 57.2 | Ordained Bishop | Louis Sébastiani de La Porta † | Bishop of Ajaccio, France |
| 26 Jun | 17.0 | Professed | Nicolás Aldazor, O.F.M. Obs. † | Member of Order of Observant Friars Minor | Bishop of San Juan de Cuyo, Argentina |
| 71.8 | Died | Pietro Stefano Speranza † | Bishop of Alatri, Italy |
| 76.4 | Died | Kasper Józef Szajowski † | Auxiliary Bishop of Gniezno, Poland |
| 29 Jun | 48.4 | Laicized | Charles-Maurice de Talleyrand-Périgord † | |
| 30 Jun | 52.6 | Installed | Václav (Wenzel) Léopold von Chlumčansky † | Bishop of Litoměřice, Czechia | Archbishop of Praha {Prague}, Czechia |