| Date | Age | Event | Bishop | Title | Current Title |
| unknown | | Born | Ignatius Batthyány † | Nemetujvar | Bishop of Transilvania, Erdély, Siebenbürgen, Romania |
| 21.9 | Professed | Basilius Bosicskovich, O.S.B.M. † | Member of Basilian Order of Saint Josaphat (Order of St. Basil the Great) | Bishop of Križevci (Kreutz) (Križevci), Croatia |
| Born | Gennaro Carelli † | Conversano | Bishop of Conversano, Italy |
| Appointed | Diego de Salinas y Cabrera, O.S.A. † | Bishop of Panamá | Bishop Emeritus |
| Resigned | Diego de Salinas y Cabrera, O.S.A. † | Bishop of Panamá | Bishop Emeritus |
| Born | Giovanni Battista Fonton, O.F.M. Conv. † | Constantinople | Bishop Emeritus of Syros (e Milos), Greece |
| Appointed | Ignace-Dominique Grisella de Rosignan † | Bishop of Saint-Jean-de-Maurienne, France |
| 17.1 | Professed | Berndard-Emmanuel (François-Pierre) de Lenzbourg, O. Cist. † | Member of Order of Cistercians | Bishop of Lausanne, Switzerland |
| Born | Petrus Alexander Samson Toczylowski † | Rajgrodensi | Auxiliary Bishop of Vilnius, Lithuania |
| Jan | 68.0 | Died | Camillo de Mari, C.R. † | Bishop of Aleria, France |
| 1 Jan | | Born | Giulio Cesare Pallavicini † | Bastia | Bishop of Luni e Sarzana, Italy |
| 2 Jan | 30.2 | Appointed | Ferenc Barkóczy de Szala † | Titular Bishop of Tanagra | Archbishop of Esztergom, Hungary |
| 62.2 | Appointed | José Botelho de Matos † | Archbishop of São Salvador da Bahia, Brazil | Archbishop Emeritus |
| 50.1 | Appointed | José Maria da Fonseca de Évora, O.F.M. † | Bishop of Porto, Portugal |
| 53.3 | Appointed | João do Nascimento (Marques de Fonseca), O.F.M. † | Bishop of Funchal, Portugal |
| 67.1 | Appointed | José de Fialho, O. Cist. † | Archbishop (Personal Title) of Guarda, Portugal | Bishop |
| 41.9 | Confirmed | Joseph Ignaz Philipp von Hessen-Darmstadt † | Bishop of Augsburg, Germany |
| 43.5 | Appointed | Francisco Pablo Matos Coronado † | Bishop of Michoacán, México |
| 47.8 | Appointed | Júlio Francisco de Oliveira, C.O. † | Bishop of Viseu, Portugal |
| 69.1 | Appointed | Domenico Riviera † | Cardinal, Cardinal-Priest of Santi XII Apostoli |
| 5 Jan | | Born | Vincenzo Nicola Pasquale Dentice, O.S.B. † | Aquedia | Archbishop of Cosenza, Italy |
| 8 Jan | 36.0 | Ordained Bishop | Bernardin-Louis Foucquet † | Archbishop of Embrun, France | Archbishop Emeritus |
| 37.5 | Ordained Bishop | Leopold Josef Hannibal Petazzi de Castel Nuovo † | Bishop of Trieste, Italy | Bishop of Ljubljana, Slovenia |
| 50.9 | Ordained Bishop | Józef Dominik Puzyna † | Bishop of Inflanty (Livonia)-Pilten, Poland |
| 11 Jan | 60.0 | Selected | Louis-Jacques-François de Vocance † | Bishop of Senez, France |
| 14 Jan | 68.0 | Died | Jacques de Forbin-Janson † | Archbishop of Arles, France |
| 15 Jan | 23.1 | Ordained Priest | Josephus Antonius Bajtay † | Priest | Bishop Emeritus of Transilvania, Erdély, Siebenbürgen, Romania |
| 22 Jan | 41.8 | Ordained Bishop | Eugenio Piloti, O.F.M. † | Titular Bishop of Porthmus | Vicar Apostolic of Shansi {Scian-Si} (Chan-Si), China |
| 25 Jan | | Appointed | Pio Gallizia, B. † | Vicar Apostolic of Ava e Pegù, Myanmar |
| Appointed | Pio Gallizia, B. † | Titular Bishop of Clysma | Vicar Apostolic of Ava e Pegù, Myanmar |
| Born | Filippo Ganucci † | Firenze | Bishop of Livorno, Italy |
| 29 Jan | 49.3 | Ordained Bishop | Richard Challoner † | Titular Bishop of Doberus | Vicar Apostolic of London District, England, Great Britain |
| Ordained Bishop | Pio Gallizia, B. † | Titular Bishop of Clysma | Vicar Apostolic of Ava e Pegù, Myanmar |
| 30 Jan | 56.1 | Appointed | Francisco José de Figueredo y Victoria † | Bishop of Popayán, Colombia | Archbishop of Guatemala |
| 50.2 | Appointed | José Alfonso Meléndez, O.F.M. † | Bishop of Potenza, Italy | Archbishop of Palermo, Italy |
| 31 Jan | | Born | Johann Baptist Lachenbauer, O. Cr. † | Broumov | Bishop of Brno, Czech Republic |
| 2 Feb | | Born | Vicente José Soto y Valcárce † | Ruitelán | Bishop of Valladolid, Spain |
| 4 Feb | 50.2 | Ordained Bishop | José Alfonso Meléndez, O.F.M. † | Bishop of Potenza, Italy | Archbishop of Palermo, Italy |
| 5 Feb | 46.1 | Ordained Bishop | João da Cruz Salgado de Castilho, O.C.D. † | Bishop of São Sebastião do Rio de Janeiro, Brazil | Bishop of Miranda (do Douro), Portugal |
| 62.3 | Ordained Bishop | José Botelho de Matos † | Archbishop of São Salvador da Bahia, Brazil | Archbishop Emeritus |
| 70.6 | Died | Apollonio Lupi, C.R.L. † | Titular Bishop of Himeria |
| 6 Feb | 56.2 | Died | Domingo Antonio de Zatarain † | Bishop of Nicaragua |
| 7 Feb | 63.8 | Died | Maffeo Niccolò Farsetti † | Archbishop of Ravenna, Italy |
| 12 Feb | 42.1 | Ordained Bishop | Joseph Ignaz Philipp von Hessen-Darmstadt † | Bishop of Augsburg, Germany |
| 19 Feb | 62.2 | Ordained Bishop | Valeriao da Costa e Gouveia † | Titular Archbishop of Lacedaemonia | Auxiliary Bishop of Lisboa {Lisbon}, Portugal |
| Ordained Bishop | Manuel Lopes Simões † | Bishop of Portalegre, Portugal |
| 57.3 | Ordained Bishop | Miguel de Távora, O.S.A. † | Archbishop of Évora, Portugal |
| 22 Feb | 53.9 | Selected | Charles-François Couton (Cantoni) † | Bishop of Nice, France |
| Died | Alfonso López Roldán, O.S.Bas. † | Bishop of Ayacucho o Huamanga (Guamanga), Peru |
| 23 Feb | 52.0 | Died | José Félix Valverde † | Bishop of Michoacán, México |
| 24 Feb | 68.6 | Died | Alessandro Caputo, O. Carm. † | Bishop of Mazara del Vallo, Italy |
| 25 Feb | 70.1 | Appointed | Manuel Coutinho † | Bishop of Lamego, Portugal |
| 23.7 | Ordained Priest | Giuseppe Francesco Maria della Torre † | Priest | Bishop of Albenga, Italy |
| 23.2 | Ordained Priest | Francesco Antonio Marcucci † | Priest | Bishop of Montalto (delle Marche), Italy |
| 23.1 | Ordained Priest | Manoel da Ressurreição, O.F.M. † | Priest of Order of Friars Minor | Bishop of São Paulo, Brazil |
| 4 Mar | 34.6 | Selected | Ferdinand Michael Cyriakus von Hallweil † | Bishop of Wiener Neustadt, Austria |
| 5 Mar | 41.2 | Ordained Bishop | Pierre de Beaupoil de Saint-Aulaire † | Bishop of Tarbes, France |
| 53.6 | Ordained Bishop | Guillaume d’Hugues de la Motte † | Bishop of Nevers, France | Archbishop of Vienne, France |
| 53.5 | Ordained Bishop | João do Nascimento (Marques de Fonseca), O.F.M. † | Bishop of Funchal, Portugal |
| Born | Lourenço Correa de Sá e Benevides † | Giumaraes | Bishop of Porto, Portugal |
| 78.9 | Resigned | Oronzio Filomarini, C.R. † | Bishop of Gallipoli, Italy | Bishop Emeritus |
| 47.9 | Ordained Bishop | Júlio Francisco de Oliveira, C.O. † | Bishop of Viseu, Portugal |
| 48.0 | Ordained Bishop | Hilário de Santa Rosa, O.F.M. † | Bishop of Macau, China | Bishop Emeritus |
| 6 Mar | 49.6 | Appointed | Gaetano de Arco † | Bishop of Nusco, Italy |
| 46.2 | Appointed | Mateo de Zamora y Penagos, O.F.M. † | Bishop of Yucatán (Mérida), México |
| 33.2 | Confirmed | Henri-Marie du Breuil de Pontbriand † | Bishop of Québec, Canada |
| 50.9 | Appointed | Diego Martínez Garrido, O.S. † | Bishop of Cartagena, Colombia | Bishop Emeritus |
| 48.4 | Appointed | Domingo Pérez Rivera † | Auxiliary Bishop of Sevilla {Seville}, Spain |
| 48.4 | Appointed | Domingo Pérez Rivera † | Titular Bishop of Gadara | Auxiliary Bishop of Sevilla {Seville}, Spain |
| 50.9 | Appointed | Antonio Maria Pescatori, O.F.M. Cap. † | Archbishop (Personal Title) of Gallipoli, Italy | Bishop |
| 10 Mar | 54.2 | Appointed | Ferdinando Romualdo Guiccioli † | Titular Bishop of Lycopolis | Archbishop of Ravenna, Italy |
| 11 Mar | | Born | Johann Valentin Heimes † | Hattenheim | Auxiliary Bishop of Worms, Germany |
| 12 Mar | 50.3 | Ordained Bishop | José Maria da Fonseca de Évora, O.F.M. † | Bishop of Porto, Portugal |
| 23.0 | Ordained Priest | Antonius de Révay † | Priest | Bishop of Nitra, Slovakia |
| 14 Mar | 76.2 | Died | Jean François Fouquet, S.J. † | Titular Bishop of Eleutheropolis in Macedonia |
| 18 Mar | 67.3 | Died | José de Fialho, O. Cist. † | Bishop of Guarda, Portugal |
| 24.0 | Ordained Priest | Giuseppe Ippoliti † | Priest | Bishop of Pistoia e Prato, Italy |
| 19 Mar | 70.3 | Ordained Bishop | Edward Dicconson † | Titular Bishop of Mallus | Vicar Apostolic of Northern District, England, Great Britain |
| 54.2 | Ordained Bishop | Ferdinando Romualdo Guiccioli † | Titular Bishop of Lycopolis | Archbishop of Ravenna, Italy |
| Born | Joseph-Barthélemy Menocchio, O.S.A. † | Carmagniolae | Titular Bishop of Porphyreon |
| 23 Mar | | Born | Antonio Maria Sacconi, O.F.M. † | Osimo, Italy | Vicar Apostolic of Shansi {Scian-Si} (Chan-Si), China |
| 25 Mar | 24.0 | Ordained Priest | Giuseppe Maria Carafa † | Priest | Bishop of Mileto, Italy |
| 29 Mar | 69.2 | Died | García Pardiñas Villar de Francos, O. de M. † | Bishop of Tarazona, Spain |
| Apr | | Died | Juan Cavero de Toledo † | Bishop of Arequipa, Peru |
| 1 Apr | 22.5 | Ordained Priest | Joseph Philipp Franz von Spaur † | Priest of Brixen {Bressanone}, Italy | Bishop |
| 26.0 | Ordained Priest | Angelo Maria Venizza † | Priest | Bishop of Città della Pieve, Italy |
| 3 Apr | 24.3 | Ordained Priest | William Walton † | Priest | Vicar Apostolic of Northern District, England, Great Britain |
| 8 Apr | 80.3 | Died | Francesco Volanti † | Bishop of Stagno (Ston), Croatia |
| 9 Apr | 39.3 | Ordained Bishop | Paul Godefroid de Berlo de Franc-Douaire † | Bishop of Namur {Namen}, Belgium |
| 38.1 | Ordained Bishop | Miguel da Anunciação (da Cunha), O.S.A. † | Bishop of Coimbra, Portugal |
| 33.3 | Ordained Bishop | Henri-Marie du Breuil de Pontbriand † | Bishop of Québec, Canada |
| 14 Apr | 42.6 | Selected | Adam Stanisław Grabowski † | Bishop of Warmia (Ermland), Poland |
| 16 Apr | 39.3 | Installed | Paul Godefroid de Berlo de Franc-Douaire † | Bishop of Namur {Namen}, Belgium |
| 37.0 | Appointed | Pierre François de Sales de Thorens † | Bishop of Aosta, Italy |
| 15.4 | Professed | Anselmo Maria Toppi, O.S.B. † | Member of Order of Saint Benedict | Bishop of Termoli, Italy |
| 17 Apr | 51.3 | Appointed | François de Beaumont d’Autichamp † | Bishop of Tulle, France |
| 54.0 | Confirmed | Charles-François Couton (Cantoni) † | Bishop of Nice, France |
| 39.9 | Appointed | Joseph-Nicolas Deschamps de Chaumont † | Bishop of Genève {Geneva}, Switzerland |
| 43.9 | Appointed | Giuseppe Filippo Felissano † | Bishop of Asti, Italy |
| 48.2 | Appointed | Pier Maria Giustiniani, O.S.B. † | Bishop of Ventimiglia, Italy |
| 35.2 | Appointed | Giorgio Maria Lascaris, C.R. † | Titular Bishop of Zenopolis in Lycia | Titular Patriarch of Jerusalem {Gerusalemme}, Palestine |
| 49.5 | Appointed | Renato Massa † | Titular Archbishop of Sebastea | Bishop of Rimini, Italy |
| 36.8 | Appointed | Giambattista Pensa † | Bishop of Fossano, Italy |
| 42.9 | Appointed | Giuseppe Filippo Porporato † | Bishop of Saluzzo, Italy |
| 62.3 | Appointed | Carlo Felice Sanmartino † | Bishop of Mondovi, Italy |
| 55.6 | Appointed | Michele Vittorio Villa † | Bishop of Ivrea, Italy |
| 20 Apr | | Born | José Antonio García Mohedano † | Talarrubias, Spain | Bishop of Guayana, Venezuela |
| 22 Apr | 57.3 | Died | Eugénio Trigueiros, O.S.A. † | Archbishop of Goa, India |
| 23 Apr | 54.0 | Ordained Bishop | Charles-François Couton (Cantoni) † | Bishop of Nice, France |
| 50.4 | Died | Etienne-Joseph de La Fare † | Bishop of Laon, France |
| 36.8 | Ordained Bishop | Giambattista Pensa † | Bishop of Fossano, Italy |
| 42.9 | Ordained Bishop | Giuseppe Filippo Porporato † | Bishop of Saluzzo, Italy |
| 207.2 | Beatified | St. Alessandro Maria Sauli, B. † | Bishop of Pavia, Italy |
| 37.0 | Ordained Bishop | Pierre François de Sales de Thorens † | Bishop of Aosta, Italy |
| 25 Apr | 43.9 | Ordained Bishop | Giuseppe Filippo Felissano † | Bishop of Asti, Italy |
| Born | Vincenzo Maria Morelli, C.R. † | Lecce | Archbishop of Otranto, Italy |
| 62.3 | Ordained Bishop | Carlo Felice Sanmartino † | Bishop of Mondovi, Italy |
| 55.6 | Ordained Bishop | Michele Vittorio Villa † | Bishop of Ivrea, Italy |
| 29 Apr | | Born | Lorenzo Caleppi † | Cervia, Italy | Cardinal, Apostolic Nuncio to Portugal |
| 62.3 | Resigned | Manuel Samaniego Jaca † | Archbishop of Burgos, Spain | Archbishop Emeritus |
| 30 Apr | 24.0 | Ordained Priest | João Rafael de Mendonça, O.S.H. † | Priest of Orden de San Jerónimo | Bishop of Porto, Portugal |
| 3 May | 73.4 | Died | Luis de Salcedo y Azcona † | Archbishop of Sevilla {Seville}, Spain |
| 6 May | 48.6 | Ordained Bishop | Domingo Pérez Rivera † | Titular Bishop of Gadara | Auxiliary Bishop of Sevilla {Seville}, Spain |
| 10 May | 59.6 | Died | Antonio Maria Santoro, O.M. † | Bishop of Ravello e Scala, Italy |
| 11 May | | Born | Saverio Granata, C.R. † | Messanen | Bishop of Agrigento (Girgenti), Italy |
| 13 May | 54.4 | Appointed | Lawrence William York, O.S.B. † | Coadjutor Vicar Apostolic of Western District, England, Great Britain | Vicar Apostolic Emeritus |
| 54.4 | Appointed | Lawrence William York, O.S.B. † | Titular Bishop of Nebbi | Vicar Apostolic Emeritus of Western District, England, Great Britain |
| 16 May | 70.6 | Died | Giacomo Lanfredini † | Cardinal, Bishop Emeritus of Osimo e Cingoli, Italy |
| 17 May | 64.6 | Died | Francesco Antonio Correr, O.F.M. Cap. † | Patriarch of Venezia {Venice}, Italy |
| 21 May | 43.6 | Died | Bartolomeo Ruspoli † | Cardinal, Cardinal-Deacon of Santi Cosma e Damiano |
| Born | Stanisław Żarnowiecki † | Premislien | Auxiliary Bishop of Poznań, Poland |
| 22 May | 62.7 | Died | Giuseppe Maria Martelli † | Archbishop Emeritus of Firenze {Florence}, Italy |
| 23 May | 40.0 | Ordained Bishop | Joseph-Nicolas Deschamps de Chaumont † | Bishop of Genève {Geneva}, Switzerland |
| 26 May | 61.6 | Resigned | Giambattista Curli † | Bishop of Nebbio, France | Bishop Emeritus |
| 27 May | 29.3 | Ordained Priest | Girolamo Bajardi † | Priest | Bishop of Borgo San Donnino, Italy |
| 23.0 | Ordained Priest | Carlo Nicodemi † | Priest | Bishop of Sant’Angelo dei Lombardi e Bisaccia, Italy |
| 29 May | 60.4 | Appointed | Giuseppe Barone † | Bishop of Calvi Risorta, Italy |
| 52.9 | Appointed | Domenico Antonio Brizi † | Bishop of Marsi, Italy |
| 49.4 | Appointed | Girolamo Curlo † | Bishop of Aleria, France |
| 52.4 | Appointed | Imrich I. Esterházy † | Bishop of Nitra, Slovakia |
| 34.8 | Confirmed | Ferdinand Michael Cyriakus von Hallweil † | Bishop of Wiener Neustadt, Austria |
| 37.2 | Appointed | Francesco Gaetano Incontri † | Archbishop of Firenze {Florence}, Italy |
| 47.1 | Appointed | Adamus Emericus Majthenyi Kesseloko † | Titular Bishop of Esbus |
| 40.7 | Appointed | Paulo Maria Mariotti † | Bishop of Sagone (Sagona), France |
| 45.9 | Appointed | Romualdu Massei † | Bishop of Nebbio, France |
| 40.6 | Appointed | Gaspar Molina Rocha, O.S.A. † | Bishop of Almería, Spain |
| 58.1 | Appointed | Diego Felipe Perea Magdaleno † | Archbishop of Burgos, Spain |
| 51.7 | Appointed | Carlo Maria Sacripante † | Cardinal-Deacon of Santa Maria in Portico (Campitelli) | Cardinal, Cardinal-Bishop of Frascati |
| 60.4 | Confirmed | Louis-Jacques-François de Vocance † | Bishop of Senez, France |
| 4 Jun | 53.0 | Ordained Bishop | Domenico Antonio Brizi † | Bishop of Marsi, Italy |
| 40.7 | Ordained Bishop | Paulo Maria Mariotti † | Bishop of Sagone (Sagona), France |
| 45.9 | Ordained Bishop | Romualdu Massei † | Bishop of Nebbio, France |
| 9 Jun | 53.9 | Installed | Guillaume d’Hugues de la Motte † | Bishop of Nevers, France | Archbishop of Vienne, France |
| 11 Jun | 51.4 | Ordained Bishop | François de Beaumont d’Autichamp † | Bishop of Tulle, France |
| 24.1 | Ordained Priest | Antonius D’Afflitto, C.R. † | Priest of Congregation of Clerics Regular | Archbishop of Cosenza, Italy |
| 23.0 | Ordained Priest | Hyacinthe-Sigismond Gerdil, B. † | Priest of Clerics Regular of St. Paul | Cardinal, Prefect of the Congregation for Propagation of the Faith |
| 23.1 | Ordained Priest | Raymund Anton von Strasoldo † | Priest of Lavant, Slovenia | Bishop of Eichstätt, Germany |
| 17 Jun | 49.8 | Died | François-Barthélemi de Salignac de La Mothe-Fénelon † | Bishop of Pamiers, France |
| 19 Jun | 71.5 | Died | Gottfried Langwerth von Simmern † | Auxiliary Bishop of Regensburg, Germany |
| 25 Jun | 35.0 | Ordained Priest | Giovanni Antonio Castelli † | Priest | Bishop Emeritus of Kotor (Cattaro), Montenegro |
| 66.5 | Died | Agostino Odoardi, O.S.B. † | Bishop of Capaccio, Italy |
| 33.4 | Selected | Jean-François-Joseph de Rochechouard de Faudoas † | Cardinal, Bishop of Laon, France |
| 29 Jun | 35.4 | Ordained Bishop | Giorgio Maria Lascaris, C.R. † | Titular Bishop of Zenopolis in Lycia | Titular Patriarch of Jerusalem {Gerusalemme}, Palestine |
| 43.1 | Installed | Giuseppe Filippo Porporato † | Bishop of Saluzzo, Italy |