| Date | Age | Event | Bishop | Title | Current Title |
| unknown | 72.8 | Died | Franz Julian Graf von Braida † | Auxiliary Bishop of Olomouc, Czech Republic |
| Died | Biagio Antonio Copeti † | Bishop of Mottola (Motula), Italy |
| 23.0 | Ordained Priest | Teodor Kazimierz Czartoryski † | Priest | Bishop of Poznań, Poland |
| Succeeded | Giovanni Girolamo della Torre, B. † | Bishop of Luni e Sarzana, Italy |
| Appointed | Tommaso Di Grazia † | Bishop of Castellammare di Stabia, Italy |
| Appointed | Giovanni Maria de Laurentiis † | Bishop of Capri, Italy |
| 39.0 | Appointed | Paul-Alexandre de Guénet † | Bishop of Saint-Pons-de-Thomières, France |
| Appointed | Miguel Bernardino de la Fuenta y Rojas † | Bishop of Santa Cruz de la Sierra, Bolivia |
| Born | John MacDonald † | Ardnamurchan, Argyllshire | Vicar Apostolic of Highland District, Scotland, Great Britain |
| 20.5 | Professed | Joachim-Enjobert de Martiliat, M.E.P. † | Member of La Société des Missions Etrangères | Vicar Apostolic of Se-Ciuen (Setchoan), China |
| Died | Isidoro Masones y Nin † | Bishop of Ales e Terralba, Italy |
| 29.0 | Ordained Priest | Ross Roe MacMahon (McMahon) † | Priest | Archbishop of Armagh, Ireland |
| 63.0 | Appointed | Teige McCarthy Rabagh † | Bishop of Cork, Ireland |
| 62.8 | Appointed | François Amédée Milliet d'Arvillars † | Archbishop of Tarentaise, France | |
| 54.6 | Ordained Bishop | Felipe Molina y Figueroa † | Bishop of Nueva Caceres, Philippines |
| 64.0 | Resigned | Ennemond-Flodoard Moret de Bourchenu † | Bishop of Vence, France | Bishop Emeritus |
| 74.0 | Died | Juan Navarro Gilaberte, O. de M. † | Bishop Emeritus of Albarracin, Spain |
| Appointed | Salvatore Rujus † | Bishop of Ales e Terralba, Italy |
| Died | Ambrogio Spinola, B. † | Bishop of Luni e Sarzana, Italy |
| 68.1 | Died | Camillo Spreti † | Bishop of Cervia, Italy |
| 59.0 | Appointed | Jean-Baptiste Surian † | Bishop of Vence, France |
| Died | Michele Gallo Vandeinde † | Bishop of Capri, Italy |
| Appointed | Francesco (Dalmazio Octavio) Vasco, O.C.D. † | Bishop of Alba (Pompea), Italy |
| 25.0 | Ordained Priest | Józef Andrzej Załuski † | Priest | Bishop of Foreign Diocese |
| 1 Jan | 50.6 | Ordained Priest | Serafino Cenci † | Priest | Cardinal, Archbishop of Benevento, Italy |
| Ordained Bishop | Giovanni Battista Lomellini, O.P. † | Bishop of Alghero, Italy | Bishop of Saluzzo, Italy |
| Born | Manuel Nicolás Rojas de Argandoña † | La Serena | Bishop of Santa Cruz de la Sierra, Bolivia |
| 3 Jan | 49.0 | Died | José Gabriel Zapata Illescas † | Bishop of Zamora, Spain |
| 4 Jan | 84.8 | Died | Giuseppe Sacripante † | Cardinal, Cardinal-Priest of S. Lorenzo in Lucina |
| 5 Jan | | Ordained Bishop | Renato Massa † | Bishop of Rimini, Italy |
| 9 Jan | | Born | Michel-François de Couët du Vivier de Lorry † | Metz, France | Bishop Emeritus of La Rochelle, France |
| 12 Jan | 51.0 | Ordained Bishop | Pedro del Cañizo Losa y Valera † | Titular Bishop of Arca in Phoenicia | Auxiliary Bishop of Cuenca, Spain |
| 59.0 | Ordained Bishop | Claude-Léonce-Octavien d'Antelmy † | Bishop of Grasse, France |
| 35.0 | Ordained Bishop | Jean-François de Macheco de Prémeaux † | Bishop of (Saint-Lizier de) Couserans, France |
| 19 Jan | 45.0 | Ordained Bishop | François de Baglion de la Salle † | Bishop of Arras, France |
| 63.8 | Ordained Bishop | José García Fernández, O.F.M. † | Bishop of Sigüenza, Spain |
| 20 Jan | 53.0 | Appointed | Stephan Cloth, O.S.B. † | Auxiliary Bishop of Fulda, Germany |
| 53.0 | Appointed | Stephan Cloth, O.S.B. † | Titular Bishop of Derbe | Auxiliary Bishop of Fulda, Germany |
| 72.8 | Appointed | Lorenzo Cozza, O.F.M. † | Cardinal, Cardinal-Priest of S. Maria in Ara Coeli |
| 75.7 | Appointed | Giuseppe Renato Imperiali † | Cardinal, Cardinal-Priest of S. Lorenzo in Lucina |
| 51.8 | Appointed | Prospero Lorenzo Lambertini † | Archbishop (Personal Title) of Ancona e Numana, Italy | Pope (Roma {Rome}, Italy) |
| 47.1 | Appointed | Thomas John Francis de Strickland de Sizorghe † | Bishop of Namur {Namen}, Belgium |
| 21 Jan | 74.1 | Resigned | Juan Navarro Gilaberte, O. de M. † | Bishop of Albarracin, Spain | Bishop Emeritus |
| 25 Jan | 53.0 | Ordained Bishop | Stephan Cloth, O.S.B. † | Titular Bishop of Derbe | Auxiliary Bishop of Fulda, Germany |
| 26 Jan | | Ordained Bishop | Antonio Francesco Valenti † | Titular Archbishop of Teodosia |
| 30 Jan | | Born | József Batthyány † | Wien, Austria | Cardinal, Archbishop of Esztergom, Hungary |
| 3 Feb | 48.8 | Ordained Bishop | Nicola Saverio Albini † | Titular Bishop of Leuce | Titular Archbishop of Atene |
| 9 Feb | | Ordained Bishop | Epifanio de Neapoli, O.S.B. † | Titular Bishop of the Titular See |
| 10 Feb | | Born | José da Avé-Maria Leite da Costa e Silva † | Santo Antão | Bishop of Angra, Portugal |
| 16 Feb | | Ordained Bishop | Giovanni Costantino Falletti † | Archbishop of Cagliari, Italy |
| 17 Feb | | Born | José Campos Julián, O.C.D. † | El Frasno, Spain | Archbishop of La Plata o Charcas, Bolivia |
| Born | Thomas Joseph Talbot † | Heythrop | Vicar Apostolic of Midland District, England, Great Britain |
| 21 Feb | | Ordained Bishop | Bernard-Antoine Pizzella † | Titular Bishop of Constantina |
| 22 Feb | | Born | Francesco Maria Locatelli † | Cesena | Cardinal, Bishop of Spoleto, Italy |
| 23 Feb | 23.5 | Succeeded | Johann Theodor von Bayern † | Bishop of Freising, Germany | Cardinal, Bishop of Regensburg, Germany |
| 77.4 | Died | Johann Franz Freiherr von Eckher von Kapfing und Liechteneck † | Bishop of Freising, Germany |
| 50.6 | Appointed | Giovanni Andrea Tria † | Bishop of Larino, Italy | Bishop Emeritus |
| 24 Feb | 43.6 | Ordained Priest | Carlo Alberto Guidobono Cavalchini † | Priest | Cardinal, Datary of the Apostolic Datary |
| 28 Feb | | Born | Giovanni Nani † | Venezia | Bishop of Brescia, Italy |
| 6 Mar | | Died | Miguel Estela, O.M. † | Bishop of Jaca, Spain |
| 7 Mar | | Born | Tomás Lorenzana Butrón † | León | Bishop of Gerona, Spain |
| 10 Mar | 57.6 | Appointed | Johann Matthias von Eyss † | Auxiliary Bishop of Trier, Germany |
| 15 Mar | 84.2 | Died | Jacques de Goyon de Matignon † | Bishop Emeritus of Condom, France |
| 17 Mar | 58.3 | Appointed | Tomás Crespo Agüero † | Archbishop of Zaragoza, Spain |
| 59.5 | Resigned | Girolamo Crispi † | Archbishop of Ravenna, Italy | Archbishop Emeritus |
| 46.1 | Appointed | Antonio Saverio Gentili † | Titular Archbishop of Petra in Palaestina | Cardinal, Prefect of the Congregation of the Council |
| 40.9 | Appointed | Felipe Itúrbide (Yturibe), O. Carm. † | Titular Archbishop of Side | Bishop Emeritus of Dubrovnik (Ragusa), Croatia |
| 42.8 | Appointed | Juan Francisco Navarro Salvador y Gilabert † | Bishop of Albarracin, Spain |
| Appointed | Matteo Odierna, O.S.B. † | Bishop of Sulmona, Italy |
| 51.1 | Appointed | Sebastián Lorenzo Pizarro, O.S.Bas. † | Bishop of Puerto Rico (Porto Rico) |
| 40.3 | Appointed | Tomás del Valle, O.P. † | Bishop of Ceuta, Spain | Bishop of Cádiz, Spain |
| 23 Mar | 46.1 | Ordained Bishop | Antonio Saverio Gentili † | Titular Archbishop of Petra in Palaestina | Cardinal, Prefect of the Congregation of the Council |
| 25 Mar | | Born | Joseph-Marie Paget † | Saint-Julien en Genevois | Bishop Emeritus of Genève {Geneva}, Switzerland |
| 27 Mar | 24.9 | Ordained Priest | Wojciech Stanisław Leski, O. Cist. † | Priest of Order of Cistercians | Bishop of Chelmno (Culma), Poland |
| Apr | | Died | Giuseppe Galliani † | Bishop of Sant’Angelo dei Lombardi-Bisaccia, Italy |
| 1 Apr | 78.5 | Died | Louis Champion de Cicé † | Vicar Apostolic of Siam, Thailand |
| 59.3 | Succeeded | Jean-Jacques Tessier de Quéralay † | Vicar Apostolic of Siam, Thailand |
| 4 Apr | 77.3 | Died | Wilhelm Graf von Leslie † | Bishop of Ljubljana, Slovenia |
| 5 Apr | | Born | Vicente Ferreira da Rocha, O.P. † | Lisboa | Bishop of Castelo Branco, Portugal |
| Born | Charles-François-SIméon de Saint-Simon de Vermandois de Rouvroy de Sandricourt † | Paris | Bishop of Agde, France |
| Born | Friedrich Wilhelm Freiherr von Westphalen † | Paderborn | Bishop of Hildesheim, Germany |
| 7 Apr | | Appointed | John Armstrong † | Bishop of Down and Connor, Ireland |
| 47.3 | Appointed | Bernard MacMahon (McMahon) † | Bishop of Clogher, Ireland | Archbishop of Armagh, Ireland |
| 10 Apr | | Born | José González Laso Santos de San Pedro † | Bustillo de Cea | Bishop of Plasencia, Spain |
| 14 Apr | 49.9 | Ordained Bishop | Maffeo Niccolò Farsetti † | Archbishop of Ravenna, Italy |
| 15 Apr | | Born | Francisco Gabriel de Olivares y Benito † | Toledo, Spain | Bishop of Durango, México |
| 23 Apr | 58.5 | Installed | Nicolás Carlos Gómez de Cervantes y Velázquez de la Cadena † | Bishop of Guadalajara, Jalisco, México |
| Born | Juan Llano Ponte † | Avilés | Bishop of Oviedo, Spain |
| 11 May | 57.8 | Ordained Bishop | Johann Matthias von Eyss † | Auxiliary Bishop of Trier, Germany |
| 63.4 | Ordained Bishop | Jeronimo Herrera y Lopez † | Bishop of Nueva Segovia, Philippines |
| Born | Ludwig Joseph Freiherr von Welden auf Laubheim und Hohenaltingen † | Hohenaltingen | Bishop of Freising, Germany |
| 12 May | | Born | Friedrich Ludwig Franz Reichsfreiherr von Wangen zu Geroldseck † | Wilwisheim | Bishop of Basel, Switzerland |
| 16 May | | Born | Marco Cornaro (Corner) † | Venezia | Bishop of Vicenza, Italy |
| 27 May | | Died | Henri de Nesmond † | Archbishop of Toulouse, France |
| 3 Jun | | Ordained Bishop | Bartolome Gascon † | Titular Bishop of Iasus |
| 5 Jun | | Appointed | Angelo Maria Nappi, O.S.M. † | Bishop of Sant’Angelo dei Lombardi-Bisaccia, Italy |
| 7 Jun | 22.1 | Ordained Deacon | Giovanni Molino † | Deacon | Cardinal, Bishop of Brescia, Italy |
| 11 Jun | 64.6 | Appointed | Giovanni Todone † | Bishop of Asti, Italy |
| 20 Jun | 70.5 | Died | Salvador Rodríguez Castelblanco, T.O.R. † | Bishop of Orihuela, Spain |
| 25 Jun | | Appointed | Francesco Arborio di Gattinara, B. † | Archbishop of Torino {Turin}, Italy |
| 59.2 | Appointed | Cornelio Bentivoglio † | Cardinal-Priest of S. Cecilia | Cardinal, Titular Archbishop of the Titular See |
| 41.1 | Appointed | Felipe Itúrbide (Yturibe), O. Carm. † | Archbishop (Personal Title) of Dubrovnik (Ragusa), Croatia | Bishop Emeritus |
| 61.5 | Died | Fortunato Morosini, O.S.B. † | Bishop of Brescia, Italy |
| 53.4 | Appointed | Gaspare Pizzolanti, O. Carm. † | Bishop of Cervia, Italy |
| 48.0 | Appointed | Domingo (Damiano) Polou † | Archbishop of Reggio Calabria, Italy |
| 30.2 | Appointed | Ferdinand Joseph Gabriel Graf von Sarnthein † | Auxiliary Bishop of Brixen {Bressanone}, Italy |
| 30 Jun | 48.0 | Ordained Bishop | Domingo (Damiano) Polou † | Archbishop of Reggio Calabria, Italy |