| Date | Age | Event | Bishop | Title | Current Title |
| unknown | 64.7 | Converted | Abraham Petros I Ardzivian † | Patriarch of Cilicia (Armenian), Lebanon |
| 58.7 | Ordained Bishop | José Bolaños Calzado, O.F.M. † | Titular Archbishop of Nisibis |
| Born | José Calvo, O.P. † | Valencia, Spain | Vicar Apostolic of Fo-Kien, China |
| Born | Josephus Cariati † | Cranganore | Archbishop of Cranganore (Angamala), India |
| 71.2 | Died | Giovanni Battista Conventati, C.O. † | Bishop Emeritus of Terracina, Priverno e Sezze, Italy |
| 48.8 | Died | Josephus Augustinus Czarnecki † | Titular Bishop of Domitiopolis |
| 24.9 | Ordained Priest | Vigilius Augustin Maria von Firmian † | Priest of Salzburg, Austria | Bishop Emeritus of Lavant, Slovenia |
| Died | Olivier-Gabriel de Lubières (Nubières) du Bouchet † | Bishop of (Saint-Bernard de) Comminges, France |
| 69.8 | Died | Carlo Maielli † | Titular Archbishop of Hemesa |
| Born | Hugh O’Reilly † | Killinkere Cavan | Bishop of Clogher, Ireland |
| 14.0 | Professed | Tadeusz Teodozy Rostocki, O.S.B.M. † | Member of Basilian Order of Saint Josaphat (Order of St. Basil the Great) | Archbishop of Kyiv-Halyč {Kiev} (Ruthenian), Ukraine |
| 52.0 | Died | Gregorius Sorger † | Bishop of Transilvania, Erdély, Siebenbürgen, Romania |
| 17.0 | Professed | Charles Walmesley, O.S.B. † | Member of Order of Saint Benedict | Vicar Apostolic of Western District, England, Great Britain |
| 17 Jan | | Born | Francisco Gomes de Avelar, C.O. † | Calhandriz | Bishop of Faro {Algarve}, Portugal |
| 71.6 | Died | Giorgio Spínola † | Cardinal, Cardinal-Bishop of Palestrina |
| 18 Jan | 77.8 | Died | François-Hyacinthe de Ploeuc de Timeur † | Bishop of Quimper, France |
| 31.4 | Ordained Bishop | Antonio Maria Priuli † | Bishop of Vicenza, Italy | Cardinal, Bishop of Padova {Padua}, Italy |
| 25 Jan | 44.6 | Ordained Bishop | Antônio de Nossa Senhora do Desterro Malheiro, O.S.B. † | Bishop of Angola e Congo, Angola | Bishop of São Sebastião do Rio de Janeiro, Brazil |
| 50.2 | Ordained Bishop | Leandro de Santo Agostinho da Piedade, O.A.D. † | Bishop of São Tomé e Príncipe |
| 26 Jan | 65.5 | Appointed | Giovanni Battista Altieri (Jr.) † | Cardinal, Cardinal-Bishop of Palestrina |
| 40.1 | Appointed | Domenico Anelli † | Bishop of Acerno, Italy | Bishop of Andria, Italy |
| 36.6 | Appointed | Teodor Kazimierz Czartoryski † | Bishop of Poznań, Poland |
| 69.5 | Appointed | Domenico De Pace † | Archbishop of Lanciano, Italy |
| 59.1 | Appointed | John Galata † | Archbishop of Durrës (Durazzo), Albania |
| 55.2 | Appointed | Pedro González García † | Bishop of Tlaxcala, México | Bishop of Avila, Spain |
| 37.4 | Confirmed | Daniel-Bertrand de Langle † | Bishop of Saint-Papoul, France |
| 49.0 | Confirmed | Jakob Ernst von Liechtenstein-Kastelkorn † | Bishop of Olomouc (Olmütz), Czech Republic | Archbishop of Salzburg, Austria |
| 41.6 | Appointed | Umberto Luigi Radicati † | Bishop of Pesaro, Italy |
| 41.3 | Appointed | Pietro Antonio Zuccari † | Bishop of Krk (Veglia), Croatia |
| 27 Jan | | Born | Jean-Chrysostome de Villaret † | Rodez, France | Bishop Emeritus of Casale Monferrato, Italy |
| 29 Jan | 55.4 | Died | Johann Franz Anton von Sirgenstein † | Auxiliary Bishop of Konstanz {Constance}, Germany |
| Feb | 74.5 | Died | Fabio Mancinforte † | Bishop Emeritus of Gubbio, Italy |
| 1 Feb | 40.1 | Ordained Bishop | Domenico Anelli † | Bishop of Acerno, Italy | Bishop of Andria, Italy |
| 69.5 | Ordained Bishop | Domenico De Pace † | Archbishop of Lanciano, Italy |
| 41.3 | Ordained Bishop | Pietro Antonio Zuccari † | Bishop of Krk (Veglia), Croatia |
| 2 Feb | 65.1 | Installed | José de Fialho, O. Cist. † | Archbishop of São Salvador da Bahia, Brazil | Bishop of Guarda, Portugal |
| Born | Gavino Murro † | Sassari | Archbishop of Sassari, Italy |
| 13 Feb | | Born | Charles Erskine of Kellie † | Rome | Cardinal, Deacon of Roma {Rome}, Italy |
| 30.4 | Appointed | Leopold Ernst von Firmian † | Bishop of Seckau, Austria | Cardinal, Bishop of Passau, Germany |
| 16 Feb | 79.1 | Died | Jean Vivant † | Auxiliary Bishop of Strasbourg, France |
| 17 Feb | 30.4 | Ordained Bishop | Leopold Ernst von Firmian † | Bishop of Seckau, Austria | Cardinal, Bishop of Passau, Germany |
| 18 Feb | 76.3 | Died | Augusto Antonio Zacco † | Bishop of Treviso, Italy |
| 21 Feb | | Selected | Eugene O’Sullivan † | Bishop of Kerry (o Ardfert) e Aghadoe, Ireland |
| 22 Feb | 66.4 | Resigned | Giuseppe Accoramboni † | Bishop of Imola, Italy | Cardinal, Cardinal-Bishop of Frascati |
| 23 Feb | 75.6 | Died | Jacinto Arana Cuesta † | Bishop of Zamora, Spain |
| 29.7 | Confirmed | François de Fitz-James † | Bishop of Soissons, France |
| 58.5 | Elevated to Cardinal | Pierre-Guérin de Tencin † | Cardinal, Archbishop of Lyon, France |
| Born | Jean-François Hubert † | Québec | Bishop Emeritus of Québec, Canada |
| 47.0 | Confirmed | Louis-Bernard de La Taste, O.S.B. † | Titular Bishop of Bethleem |
| 39.0 | Appointed | Francisco Juan Leiza (de Leyva) † | Auxiliary Bishop of Tlaxcala, México |
| 39.0 | Appointed | Francisco Juan Leiza (de Leyva) † | Titular Bishop of Geras | Auxiliary Bishop of Tlaxcala, México |
| 65.6 | Appointed | Tommaso Maria Marelli, C.O. † | Archbishop (Personal Title) of Imola, Italy | Bishop |
| 50.1 | Appointed | Simon Negri † | Bishop of Lezhë {Lesh, Alessio}, Albania |
| 43.2 | Appointed | Andrés Núñez Monteagudo † | Auxiliary Bishop of Toledo, Spain |
| 43.2 | Appointed | Andrés Núñez Monteagudo † | Titular Bishop of Maxula Prates | Auxiliary Bishop of Toledo, Spain |
| 45.7 | Appointed | Juan Antonio Pérez Arellano † | Auxiliary Bishop of Toledo, Spain |
| 45.7 | Appointed | Juan Antonio Pérez Arellano † | Titular Bishop of Casius | Auxiliary Bishop of Toledo, Spain |
| 71.3 | Elevated to Cardinal | Gaetano Stampa † | Cardinal, Archbishop of Milano {Milan}, Italy |
| Mar | 70.0 | Died | Antonio Pacecco, O.F.M. † | Bishop of Bisceglie, Italy |
| 1 Mar | 41.7 | Ordained Bishop | Umberto Luigi Radicati † | Bishop of Pesaro, Italy |
| 70.4 | Died | Giovanni Francesco Maria Tenderini † | Bishop of Civita Castellana e Orte, Italy |
| 2 Mar | | Born | Domenico Spinucci † | Fermo | Cardinal, Archbishop of Benevento, Italy |
| Born | Philipp Franz Wilderich Nepomuk von Walderdorf † | Mainz | Bishop of Speyer, Germany |
| 5 Mar | 76.4 | Died | Giovanni Todone † | Bishop of Asti, Italy |
| 8 Mar | 43.3 | Selected | Andrzej Stanisław Załuski † | Bishop of Chelmno (Culma, Kulm), Poland | Bishop of Kraków, Poland |
| 11 Mar | 44.6 | Died | Alberico Simonetta † | Bishop of Como, Italy |
| 14 Mar | 22.9 | Ordained Priest | Antonio Puoti † | Priest | Archbishop of Amalfi, Italy |
| 16 Mar | 24.1 | Ordained Priest | Jean-Olivier Briand † | Priest | Bishop Emeritus of Québec, Canada |
| Born | Gregorio José de Omaña y Sotomayor † | Santiago Tianguistengo | Bishop of Antequera, Oaxaca, México |
| 17 Mar | | Born | Franc Jožef Mikolič (Mikolitsch) † | Ljubljana | Auxiliary Bishop of Ljubljana, Slovenia |
| 21 Mar | 78.2 | Died | Joseph-Pierre de Castellane † | Bishop of Fréjus, France |
| 76.2 | Died | Joseph de Révol † | Bishop Emeritus of Oloron (Oloron-Sainte-Marie), France |
| 22 Mar | 27.8 | Selected | François-Louis Pourroy de L’Auberivière † | Bishop of Québec, Canada |
| 26 Mar | 63.7 | Died | Cristoforo Palmieri † | Bishop of Sovana (Soana), Italy |
| 28 Mar | | Born | Francisco Casto Royo † | El Redal, Spain | Titular Archbishop of Amida |
| 24.2 | Ordained Priest | Giacinto Sardi † | Priest | Bishop of Aquino e Pontecorvo, Italy |
| 30 Mar | 42.7 | Ordained Priest | Ferdinando Maria de Rossi † | Priest | Cardinal, Prefect of the Congregation of the Council |
| 31 Mar | | Born | Felipe Antonio Fernández Vallejo † | Ocaña | Archbishop of Santiago de Compostela, Spain |
| Born | Wojciech Górski † | Maków | Bishop of Kielce, Poland |
| Apr | | Died | Peter Archdeacon, O.F.M. † | Bishop of Killala, Ireland |
| 1 Apr | 62.4 | Appointed | Giovanni Battista Barni † | Cardinal, Apostolic Nuncio to Spain |
| 5 Apr | 37.6 | Ordained Bishop | Daniel-Bertrand de Langle † | Bishop of Saint-Papoul, France |
| 47.1 | Ordained Bishop | Louis-Bernard de La Taste, O.S.B. † | Titular Bishop of Bethleem |
| 9 Apr | | Born | Bernardino Marini, C.R.L. † | Luogo di Clissa | Bishop of Treviso, Italy |
| 16 Apr | | Born | Ferenc Miklósy † | Csákvár | Bishop of Oradea Mare {Gran Varadino, Nagyvárad}, Romania |
| 19 Apr | | Born | Pierre de Séguiran † | Aix-en-Provence | Bishop of Nevers, France |
| 24 Apr | 82.2 | Resigned | Juan Álvaro Cienfuegos Villazón, S.J. † | Archbishop of Monreale, Italy | Cardinal, Archbishop Emeritus |
| Appointed | Michael O’Reilly † | Bishop of Derry, Ireland | Archbishop of Armagh, Ireland |
| Appointed | Bernard O’Rourke † | Bishop of Killala, Ireland |
| Confirmed | Eugene O’Sullivan † | Bishop of Kerry (o Ardfert) e Aghadoe, Ireland |
| 28 Apr | | Died | Juan Francisco Antonio de Escandón, C.R. † | Archbishop of Lima, Peru |
| May | | Died | John O’Hart † | Bishop of Achonry, Ireland |
| 57.0 | Died | Giuseppe Isidoro Persico † | Bishop of Isernia, Italy |
| 1 May | | Born | Filippo Campanelli † | Mantelica, Italy | Cardinal, Cardinal-Deacon of San Cesareo in Palatio |
| 4 May | 43.3 | Appointed | Troiano Acquaviva d’Aragona † | Cardinal, Archbishop of Monreale, Italy |
| 63.3 | Appointed | Juan Domingo Manzano Carvajal † | Bishop of Jaca, Spain |
| 64.1 | Died | Domenico Potenza † | Bishop of Montepeloso, Italy |
| 44.0 | Appointed | Juan Manuel Rodríguez Castañón † | Auxiliary Bishop of Zaragoza, Spain | Bishop of Tui, Spain |
| 44.0 | Appointed | Juan Manuel Rodríguez Castañón † | Titular Bishop of Uthina | Bishop of Tui, Spain |
| 67.1 | Appointed | Niccolò Schiaffinati, O.S.A. † | Bishop of Ischia, Italy |
| 45.9 | Appointed | Bernardino Vari † | Bishop of Civita Castellana e Orte, Italy |
| 7 May | | Born | Salvatore Maria Lombardi † | Magdalena | Bishop of Andria, Italy |
| 8 May | | Born | Miguel da Madre de Deus da Cruz, O.F.M. † | Villa da Torre de Moncorvo, Portugal | Archbishop of Braga, Portugal |
| 10 May | 73.2 | Died | Carlos Alamán Ferrer † | Bishop of Barbastro, Spain |
| 55.0 | Died | José Esteban Noriega, O. Praem. † | Bishop of Solsona, Spain |
| 43.4 | Ordained Bishop | Andrés Núñez Monteagudo † | Titular Bishop of Maxula Prates | Auxiliary Bishop of Toledo, Spain |
| 45.2 | Ordained Bishop | Hernando Eusebio Oscot y Colombres, O.P. † | Titular Bishop of Evaria | Auxiliary Bishop of Fo-Kien, China |
| 45.9 | Ordained Bishop | Juan Antonio Pérez Arellano † | Titular Bishop of Casius | Auxiliary Bishop of Toledo, Spain |
| 26.4 | Ordained Priest | Fernando de Sousa e Silva † | Priest | Cardinal, Patriarch of Lisboa {Lisbon}, Portugal |
| Born | John Thomas Troy, O.P. † | Porterstown | Archbishop of Dublin, Ireland |
| 45.9 | Ordained Bishop | Bernardino Vari † | Bishop of Civita Castellana e Orte, Italy |
| 11 May | 85.4 | Died | Benito Madueño y Ramos † | Auxiliary Bishop of Toledo, Spain |
| 12 May | | Born | Edmund Maria Josef Artz von und zu Vasegg † | Einsberg | Auxiliary Bishop of Wien {Vienna}, Austria |
| 17 May | 55.5 | Ordained Bishop | Pedro González García † | Bishop of Tlaxcala, México | Bishop of Avila, Spain |
| 23 May | 24.2 | Ordained Priest | Giuseppe Cacace † | Priest | Bishop of Monopoli, Italy |
| 23.3 | Ordained Priest | Giovanni Battista Orsi † | Priest | Bishop of Fano, Italy |
| 24 May | | Born | Januarius Vincentius Tortora † | Nucerin | Bishop of Fondi (Fundi), Italy |
| 29 May | | Appointed | Sylvester Lloyd, O.F.M. † | Bishop of Waterford and Lismore, Ireland |
| 81.4 | Resigned | Richard Piers † | Bishop of Waterford and Lismore, Ireland | Bishop Emeritus |
| 31 May | 30.0 | Ordained Bishop | François de Fitz-James † | Bishop of Soissons, France |
| Jun | | Born | Bartolomeo Criscuolo † | Castri Maris | Bishop of Lettere (-Gragnano), Italy |
| 4 Jun | 81.4 | Died | Richard Piers † | Bishop Emeritus of Waterford and Lismore, Ireland |
| 7 Jun | 67.2 | Ordained Bishop | Niccolò Schiaffinati, O.S.A. † | Bishop of Ischia, Italy |
| 16 Jun | | Born | Annibale Di Leo † | San Vito dei Normanni | Archbishop of Brindisi, Italy |
| Born | Jean-Denis de Vienne † | Saint-Germain-en-Laye | Auxiliary Bishop of Lyon, France |
| 21 Jun | 79.3 | Died | Antoine de Charpin de Genetines † | Bishop Emeritus of Limoges, France |
| 63.5 | Ordained Bishop | Juan Domingo Manzano Carvajal † | Bishop of Jaca, Spain |
| 44.1 | Ordained Bishop | Juan Manuel Rodríguez Castañón † | Titular Bishop of Uthina | Bishop of Tui, Spain |
| 22 Jun | | Appointed | Cayetano Benítez de Lugo, O.P. † | Bishop of Zamora, Spain |
| 44.5 | Appointed | Claude de Chabannes (Cabannes) † | Bishop of Gap, France |
| 47.5 | Appointed | Paolo Cernuschi † | Bishop of Como, Italy |
| 54.7 | Appointed | Benedetto De Luca † | Bishop of Treviso, Italy |
| 46.4 | Appointed | Carlo Francesco Durini † | Titular Archbishop of Rhodus | Cardinal, Bishop of Pavia, Italy |
| 58.6 | Appointed | Antonio Guglielmi † | Archbishop of Urbino, Italy |
| 49.2 | Appointed | Antonio Maria Pescatori, O.F.M. Cap. † | Titular Archbishop of Ephesus | Bishop of Gallipoli, Italy |
| 69.5 | Appointed | Krzysztof Antoni Szembek † | Archbishop of Gniezno, Poland |
| 25 Jun | 48.3 | Resigned | Pierre-Herman Dosquet, P.S.S. † | Bishop of Québec, Canada | Bishop Emeritus |
| 28 Jun | 61.1 | Ordained Bishop | Juan García Abadiano † | Bishop of Caracas, Santiago de Venezuela |
| 49.2 | Ordained Bishop | Antonio Maria Pescatori, O.F.M. Cap. † | Titular Archbishop of Ephesus | Bishop of Gallipoli, Italy |