| Date | Age | Event | Bishop | Title | Current Title |
| Apr | 75.0 | Retired | Francesco Canalini | Apostolic Nuncio to Switzerland | Apostolic Nuncio Emeritus |
| 75.0 | Retired | Francesco Canalini | Apostolic Nuncio to Liechtenstein | Apostolic Nuncio Emeritus to Switzerland |
| 1 Apr | 59.2 | Appointed | Peter Holiday | Bishop of Kroonstad, South Africa |
| 83.8 | Died | Varkey Vithayathil, C.SS.R. † | Cardinal, Major Archbishop of Ernakulam-Angamaly (Syro-Malabarese), India |
| 2 Apr | 44.3 | Ordained Bishop | Rolando José Álvarez Lagos | Bishop of Matagalpa, Nicaragua |
| 63.5 | Installed | Leonardo Antonio Paolo Bonanno | Bishop of San Marco Argentano-Scalea, Italy |
| 56.3 | Appointed | François Marie Aimé Marius Fonlupt | Bishop of Rodez (-Vabres), France |
| 75.9 | Retired | Bellino Giusto Ghirard | Bishop of Rodez (-Vabres), France | Bishop Emeritus |
| 66.5 | Installed | Mauro Piacenza | Cardinal-Deacon of San Paolo alle Tre Fontane | Cardinal, Prefect of the Congregation for the Clergy |
| 64.4 | Installed | Atilano Rodríguez Martínez | Bishop of Sigüenza-Guadalajara, Spain |
| 57.2 | Ordained Bishop | Tomo Vukšić | Bishop of Bosnia and Herzegovina, Military |
| 3 Apr | 64.8 | Installed | Victor Abagna Mossa | Bishop of Owando, Congo |
| 84.0 | Died | William Henry Bullock † | Bishop Emeritus of Madison, Wisconsin, USA |
| 74.1 | Installed | Raymundo Damasceno Assis | Cardinal-Priest of Immacolata al Tiburtino | Cardinal, Archbishop of Aparecida, Sao Paulo, Brazil |
| 64.1 | Ordained Bishop | Jean-Luc Hudsyn | Titular Bishop of Apt | Auxiliary Bishop of Mechelen-Brussel {Malines-Brussels}, Belgium |
| 52.6 | Ordained Bishop | Jean Kockerols | Titular Bishop of Ypres | Auxiliary Bishop of Mechelen-Brussel {Malines-Brussels}, Belgium |
| 62.8 | Installed | Jean Marie Henri Legrez, O.P. | Archbishop of Albi (-Castres-Lavaur), France |
| 57.0 | Ordained Bishop | Léon Lemmens | Titular Bishop of Municipa | Auxiliary Bishop of Mechelen-Brussel {Malines-Brussels}, Belgium |
| 46.3 | Ordained Bishop | Ildo Augusto dos Santos Lopes Fortes | Bishop of Mindelo, Cape Verde |
| 53.0 | Ordained Bishop | Mauro Maria Morfino, S.D.B. | Bishop of Alghero-Bosa, Italy |
| 4 Apr | 71.4 | Resigned | Michael John Malone | Bishop of Maitland-Newcastle, Australia | Bishop Emeritus |
| 58.4 | Appointed | William Joseph Wright | Bishop of Maitland-Newcastle, Australia |
| 5 Apr | 52.2 | Appointed | Alfred Agyenta | Bishop of Navrongo-Bolgatanga, Ghana |
| 6 Apr | 55.9 | Appointed | Joseph Robert Binzer | Auxiliary Bishop of Cincinnati, Ohio, USA |
| 55.9 | Appointed | Joseph Robert Binzer | Titular Bishop of Subbar | Auxiliary Bishop of Cincinnati, Ohio, USA |
| 60.4 | Appointed | Moses M. Costa, C.S.C. | Bishop of Chittagong, Bangladesh |
| 69.1 | Appointed | Antonio Marino | Bishop of Mar del Plata, Argentina |
| 62.0 | Appointed | Rolando Crisostomo Santos, C.M. | Bishop of Alotau-Sideia, Papua New Guinea |
| 7 Apr | 41.4 | Ordained Bishop | Stephen Dami Mamza | Bishop of Yola, Nigeria |
| 74.8 | Retired | Lawrence John Saldanha | Archbishop of Lahore, Pakistan | Archbishop Emeritus |
| 8 Apr | 47.2 | Appointed | Agapitus Enuyehnyoh Nfon | Auxiliary Bishop of Bamenda, Cameroon |
| 47.2 | Appointed | Agapitus Enuyehnyoh Nfon | Titular Bishop of Unizibira | Auxiliary Bishop of Bamenda, Cameroon |
| 9 Apr | 53.4 | Installed | Cecilio Raúl Berzosa Martínez | Bishop of Ciudad Rodrigo, Spain |
| 76.6 | Retired | Ramiro Díaz Sánchez, O.M.I. | Vicar Apostolic of Machiques, Venezuela | Vicar Apostolic Emeritus |
| 60.2 | Appointed | Jesús Alfonso Guerrero Contreras, O.F.M. Cap. | Bishop of Machiques, Venezuela |
| 59.3 | Appointed | John Moolachira | Coadjutor Archbishop of Guwahati, India | Archbishop |
| 51.8 | Ordained Bishop | Benjamin S. Phiri | Titular Bishop of Nachingwea | Auxiliary Bishop of Chipata, Zambia |
| 50.9 | Appointed | György Udvardy | Bishop of Pécs, Hungary |
| 51.4 | Resigned | András Veres | Apostolic Administrator of Pécs, Hungary | Bishop of Szombathely, Hungary |
| 10 Apr | 66.0 | Ordained Bishop | Pio Gonçalo Alves de Souza | Titular Bishop of Aquae Flaviae | Auxiliary Bishop of Porto, Portugal |
| 69.5 | Installed | Jean Charles Émile Gardin, C.S.Sp. | Bishop of Impfondo, Congo |
| 46.3 | Installed | Ildo Augusto dos Santos Lopes Fortes | Bishop of Mindelo, Cape Verde |
| 57.4 | Installed | Giuseppe Pellegrini | Bishop of Concordia-Pordenone, Italy |
| 58.5 | Installed | Wilmar Santin, O. Carm. | Prelate of Itaituba, Para, Brazil |
| 11 Apr | 53.8 | Installed | Robert Anthony Daniels | Bishop of Grand Falls, Newfoundland, Canada |
| 62.2 | Appointed | Paul Donoghue, S.M. | Bishop of Rarotonga, Cook Islands, Pacific (Oceania) |
| 75.9 | Retired | Stuart France O’Connell, S.M. | Bishop of Rarotonga, Cook Islands, Pacific (Oceania) | Bishop Emeritus |
| 12 Apr | 46.3 | Appointed | José Manuel Imbamba | Archbishop of Saurimo, Angola |
| 45.7 | Ordained Bishop | Eugenio Andrés Lira Rugarcía | Titular Bishop of Buxentum | Auxiliary Bishop of Puebla de los Ángeles, Puebla, México |
| 78.0 | Appointed | Luis María Pérez de Onraita Aguirre | Archbishop of Malanje, Angola | Archbishop Emeritus |
| 51.1 | Appointed | Inácio Saure, I.M.C. | Bishop of Tete, Mozambique |
| 75.7 | Retired | Carlos Arthur Sevilla, S.J. | Bishop of Yakima, Washington, USA | Bishop Emeritus |
| 74.8 | Died | Ioan Şişeştean † | Bishop of Maramureş (Romanian), Romania |
| 56.0 | Ordained Bishop | Dagoberto Sosa Arriaga | Titular Bishop of Gummi in Byzacena | Bishop of Tlapa, Guerrero, México |
| 53.5 | Appointed | Joseph Jude Tyson | Bishop of Yakima, Washington, USA |
| 13 Apr | 59.5 | Appointed | Jacinto Bergmann | Archbishop of Pelotas, Rio Grande do Sul, Brazil |
| 54.6 | Installed | Peter Joseph Hundt | Bishop of Corner Brook and Labrador, Newfoundland, Canada |
| 65.9 | Appointed | Hélio Adelar Rubert | Archbishop of Santa Maria, Rio Grande do Sul, Brazil |
| 69.6 | Appointed | Pedro Ercílio Simon | Archbishop of Passo Fundo, Rio Grande do Sul, Brazil | Archbishop Emeritus |
| 14 Apr | 79.5 | Died | Louis Jean Dufaux † | Bishop Emeritus of Grenoble, France |
| 86.4 | Died | Jean Gratton † | Bishop Emeritus of Mont-Laurier, Québec, Canada |
| 64.4 | Installed | Jonás Guerrero Corona | Bishop of Culiacán, Sinaloa, México |
| 15 Apr | 71.0 | Appointed | Charles Henry Dufour | Archbishop of Kingston in Jamaica, Antilles |
| 63.1 | Installed | Gilles Lemay | Bishop of Amos, Québec, Canada |
| 77.0 | Retired | Donald James Reece | Archbishop of Kingston in Jamaica, Antilles | Archbishop Emeritus |
| 16 Apr | 59.8 | Ordained Bishop | Ephrem Yousif Abba Mansoor | Archbishop of Baghdad (Syrian), Iraq |
| 67.4 | Ordained Bishop | Youhanna Boutros Moshe | Archbishop of Mossul (Syrian), Iraq |
| 48.4 | Ordained Bishop | Miguel Olaortúa Laspra, O.S.A. | Titular Bishop of Abbir Maius | Vicar Apostolic of Iquitos, Peru |
| 63.8 | Appointed | Beniamino Pizziol | Bishop of Vicenza, Italy |
| 18 Apr | 41.9 | Appointed | José Arturo Cepeda Escobedo | Auxiliary Bishop of Detroit, Michigan, USA |
| 41.9 | Appointed | José Arturo Cepeda Escobedo | Titular Bishop of Tagase | Auxiliary Bishop of Detroit, Michigan, USA |
| 86.4 | Died | Giovanni Saldarini † | Cardinal, Archbishop Emeritus of Torino {Turin}, Italy |
| 19 Apr | 56.3 | Ordained Bishop | Mark Leonard Bartchak | Bishop of Altoona-Johnstown, Pennsylvania, USA |
| 64.9 | Appointed | George Stack | Archbishop of Cardiff, Wales, Great Britain |
| 20 Apr | 55.7 | Appointed | Faustino Armendáriz Jiménez | Bishop of Querétaro, México |
| 54.1 | Appointed | Fernando Natalio Chomalí Garib | Archbishop of Concepción (Santissima Concezione), Chile |
| 47.1 | Appointed | Peter Andrew Comensoli | Auxiliary Bishop of Sydney, Australia |
| 47.1 | Appointed | Peter Andrew Comensoli | Titular Bishop of Tigisi in Numidia | Auxiliary Bishop of Sydney, Australia |
| 76.3 | Retired | Mario de Gasperín Gasperín | Bishop of Querétaro, México | Bishop Emeritus |
| 53.5 | Resigned | Pedro Mario Ossandón Buljevic | Apostolic Administrator of Concepción (Santissima Concezione), Chile | Auxiliary Bishop of Santiago de Chile |
| 48.5 | Appointed | Mylo Hubert Claudio Vergara | Bishop of Pasig, Philippines |
| 21 Apr | 67.5 | Appointed | Mosè Marcia | Bishop of Nuoro, Italy |
| 75.6 | Retired | Pietro Meloni | Bishop of Nuoro, Italy | Bishop Emeritus |
| 25 Apr | 50.9 | Installed | György Udvardy | Bishop of Pécs, Hungary |
| 54.4 | Ordained Bishop | William John Waltersheid | Titular Bishop of California | Auxiliary Bishop of Pittsburgh, Pennsylvania, USA |
| 26 Apr | 75.5 | Retired | Gerald Andrew Gettelfinger | Bishop of Evansville, Indiana, USA | Bishop Emeritus |
| 85.4 | Died | José María Izuzquiza Herranz, S.J. † | Vicar Apostolic Emeritus of Jaén en Peru o San Francisco Javier |
| 50.0 | Appointed | Charles Coleman Thompson | Bishop of Evansville, Indiana, USA |
| 27 Apr | 62.9 | Appointed | Dario Campos, O.F.M. | Bishop of Cachoeiro do Itapemirim, Espirito Santo, Brazil |
| 86.7 | Died | Paul Vincent Donovan † | Bishop Emeritus of Kalamazoo, Michigan, USA |
| 65.2 | Appointed | Felipe de Jesús Estévez | Bishop of Saint Augustine, Florida, USA |
| 75.6 | Retired | Victor Benito Galeone | Bishop of Saint Augustine, Florida, USA | Bishop Emeritus |
| 28 Apr | 54.7 | Installed | Augustine Obiora Akubeze | Archbishop of Benin City, Nigeria |
| 49.6 | Appointed | Virgilio do Nascimento Antunes | Bishop of Coimbra, Portugal |
| 76.2 | Retired | Albino Mamede Cleto † | Bishop of Coimbra, Portugal | Bishop Emeritus |
| 29 Apr | 52.1 | Ordained Bishop | Miguel Ángel D’Annibale | Titular Bishop of Nasai | Bishop of Río Gallegos, Argentina |
| 85.3 | Installed | José Manuel Estepa Llaurens | Cardinal-Priest of San Gabriele Arcangelo all’Acqua Traversa | Cardinal, Archbishop Emeritus of Spain, Military |
| 46.1 | Ordained Bishop | José Francisco Falcão de Barros | Titular Bishop of Augurus | Auxiliary Bishop of Brazil, Military |
| 79.8 | Died | Salim Ghazal, B.S. † | Curial Bishop Emeritus of Antiochia {Antioch} (Melkite Greek), Syria |
| 87.4 | Died | Anthony Francis Mestice † | Auxiliary Bishop Emeritus of New York, New York, USA |
| 52.6 | Ordained Bishop | Joseph Nguyen Tan Tuoc | Coadjutor Bishop of Phú Cuong, Viet Nam | Bishop |
| 61.2 | Installed | Kazimierz Nycz | Cardinal-Priest of Santi Silvestro e Martino ai Monti | Cardinal, Archbishop of Warszawa {Warsaw}, Poland |
| 30 Apr | 63.5 | Appointed | Saúl Figueroa Albornoz | Bishop of Puerto Cabello, Venezuela |
| 44.0 | Ordained Bishop | Andrew Jagaye Karnley | Bishop of Cape Palmas, Liberia |
| 49.3 | Ordained Bishop | Gabriel Sayaogo | Bishop of Manga, Burkina Faso |
| 54.1 | Ordained Bishop | Sanctus Lino Wanok | Bishop of Nebbi, Uganda |