Date | Age | Event | Bishop | Title | Current Title |
1 May | 44.5 | Ordained Bishop | René-Désiré-Romain Boisguérin, M.E.P. † | Bishop of Yibin [Suifu], China | Bishop Emeritus |
50.4 | Ordained Bishop | Georges-Léon Landry † | Bishop of Hearst, Ontario, Canada | Bishop Emeritus |
| Born | Joseph Francis Martino | | Bishop Emeritus of Scranton, Pennsylvania, USA |
41.2 | Ordained Bishop | Maurice Roy † | Bishop of Trois-Rivières, Québec, Canada | Cardinal, Archbishop Emeritus of Québec, Canada |
57.2 | Ordained Bishop | Pietro Villa, F.S.C.J. † | Titular Bishop of Lystra | Auxiliary Bishop of Ostia, Italy |
2 May | 45.2 | Appointed | Giuseppe Burzio † | Apostolic Nuncio to Bolivia | Apostolic Nuncio |
| Born | José Luis Mollaghan | | Archbishop Emeritus of Rosario, Argentina |
| Born | Adriano Tessarollo | | Bishop Emeritus of Chioggia, Italy |
3 May | 57.3 | Appointed | Walenty Dymek † | Archbishop of Poznań, Poland |
60.1 | Appointed | Kálmán József Papp † | Bishop of Győr (Raab), Hungary |
4 May | 25.6 | Ordained Priest | John James Ward † | Priest of Los Angeles, California, USA | Auxiliary Bishop Emeritus |
48.5 | Appointed | Andrzej Wronka † | Apostolic Administrator of Gdańsk, Poland | Auxiliary Bishop of Wrocław {Breslavia}, Poland |
5 May | 60.1 | Died | Antonio Colturato, O.F.M. Cap. † | Bishop of Botucatu, Brazil |
28.5 | Ordained Priest | Matthieu Kanyama † | Priest of Kabinda, Congo (Dem. Rep.) | Bishop Emeritus |
| Born | André Marceau | | Bishop Emeritus of Nice, France |
29.8 | Ordained Priest | Joseph Ngogi Nkongolo † | Priest | Bishop Emeritus of Mbujimayi, Congo (Dem. Rep.) |
42.5 | Ordained Bishop | Arturo Tabera Araoz, C.M.F. † | Titular Bishop of Lyrbe | Cardinal, Prefect of the Congregation of the Affairs of Religious |
6 May | 60.4 | Died | Kazimierz Bukraba † | Bishop of Pinsk, Belarus |
62.5 | Resigned | Karol Niemira † | Auxiliary Bishop of Pinsk, Belarus | Auxiliary Bishop Emeritus |
7 May |
| Born | Jesús Carlos Cabrero Romero | | Archbishop Emeritus of San Luis Potosí, México |
54.0 | Appointed | Zygmunt Choromański † | Auxiliary Bishop of Warszawa {Warsaw}, Poland |
54.0 | Appointed | Zygmunt Choromański † | Titular Bishop of Panopolis | Auxiliary Bishop of Warszawa {Warsaw}, Poland |
| Born | William (Leonard) Kenney, C.P. | | Auxiliary Bishop Emeritus of Birmingham, England, Great Britain |
53.3 | Appointed | Franciszek Salezy Korszyński † | Auxiliary Bishop of Włocławek (Kujawy, Kalisze), Poland |
53.3 | Appointed | Franciszek Salezy Korszyński † | Titular Bishop of Orisa | Auxiliary Bishop of Włocławek (Kujawy, Kalisze), Poland |
54.6 | Appointed | Wacław Majewski † | Auxiliary Bishop of Warszawa {Warsaw}, Poland |
54.6 | Appointed | Wacław Majewski † | Titular Bishop of Docimium | Auxiliary Bishop of Warszawa {Warsaw}, Poland |
65.0 | Resigned | Pierre-Jean-Marie-Louis Peurois, O.F.M. † | Auxiliary Bishop of Rabat, Morocco | Auxiliary Bishop of Rabat, Morocco |
78.8 | Died | Henri Vielle, O.F.M. † | Vicar Apostolic of Rabat, Morocco |
8 May | 45.2 | Appointed | Giuseppe Burzio † | Titular Archbishop of Gortyna | Apostolic Nuncio |
78.1 | Retired | Auguste-Joseph-Marie Cogneau † | Auxiliary Bishop of Quimper [Cornouailles](-Léon), France | Auxiliary Bishop Emeritus |
76.5 | Died | James Dey † | Vicar Apostolic of Great Britain, Military |
89.2 | Died | Adolphe-Yves-Marie Duparc † | Bishop of Quimper [Cornouailles](-Léon), France |
50.2 | Appointed | Pietro Raimondi † | Bishop of Crotone (Cotrone), Italy | Bishop Emeritus |
9 May |
| Born | George Stack | | Archbishop Emeritus of Cardiff-Menevia, Wales, Great Britain |
10 May | 55.5 | Appointed | Thomas Tien Ken-hsin (Tienchensing), S.V.D. † | Cardinal, Archbishop of Beijing [Peking], China |
44.9 | Appointed | Faustino M. Tissot, S.X. † | Bishop of Zhengzhou [Chengchow], China | Bishop Emeritus |
60.0 | Appointed | Jan Cornelius van Sambeek, M. Afr. † | Vicar Apostolic of Kigoma, Tanzania | Bishop Emeritus of Kigoma, Tanzania |
11 May |
| Born | Maurice Anthony Crowley, S.P.S. | | Bishop Emeritus of Kitale, Kenya |
49.7 | Appointed | Joseph Calasanz Fließer (Fliesser) † | Bishop of Linz, Austria | Bishop Emeritus |
62.2 | Appointed | Saverio Ritter † | Apostolic Internuncio to Czechoslovakia | Official of the Secretariat of State |
12 May | 28.2 | Ordained Priest | Cyriaque Siméon Obamba † | Priest | Bishop Emeritus of Mouila, Gabon |
26.1 | Ordained Priest | José Tomás Sánchez † | Priest of Sorsogon, Philippines | Cardinal, Prefect Emeritus of the Congregation for the Clergy |
44.7 | Ordained Bishop | Bl. Stefan Wyszyński † | Bishop of Lublin, Poland | Cardinal, Archbishop of Gniezno, Poland |
13 May | 67.2 | Succeeded | Lucas Guillermo Castillo Hernández † | Archbishop of Caracas, Santiago de Venezuela |
85.2 | Died | Felipe Rincón González † | Archbishop of Caracas, Santiago de Venezuela |
14 May | 39.9 | Appointed | Giuseppe Siri † | Archbishop of Genova, Italy | Cardinal, Archbishop Emeritus of Genova-Bobbio, Italy |
16 May |
| Born | André Gazaille | | Bishop Emeritus of Nicolet, Québec, Canada |
17 May | 77.7 | Appointed | Luigi Ferri † | Titular Bishop of Livias | Bishop Emeritus of Montalto (delle Marche), Italy |
77.7 | Retired | Luigi Ferri † | Bishop of Montalto (delle Marche), Italy | Bishop Emeritus |
77.7 | Retired | Luigi Ferri † | Bishop of Ripatransone, Italy | Bishop Emeritus of Montalto (delle Marche), Italy |
| Born | Antonio Lanfranchi † | | Archbishop of Modena-Nonantola, Italy |
18 May | 64.6 | Died | Jean-Marie-Michel Blois, M.E.P. † | Archbishop of Shenyang [Mukden, Fengtien], China |
79.9 | Appointed | José María Caro Rodríguez † | Cardinal-Priest of Santa Maria della Scala | Cardinal, Archbishop of Santiago de Chile |
66.4 | Died | Edouard Rostaing, M.S. † | Vicar Apostolic of Antsirabé, Madagascar |
19 May | 26.2 | Ordained Priest | Constantin Guirma † | Priest of Ouagadougou, Burkina Faso | Bishop Emeritus of Kaya, Burkina Faso |
48.6 | Ordained Bishop | Franciszek Jop † | Titular Bishop of Daulia | Bishop of Opole, Poland |
| Born | Juventino Kestering † | | Bishop of Rondonópolis - Guiratinga, Mato Grosso, Brazil |
48.3 | Ordained Bishop | Giacomo Palombella † | Bishop of Muro Lucano, Italy | Archbishop Emeritus of Matera, Italy |
| Born | Anselmo Guido Pecorari | | Apostolic Nuncio |
53.9 | Ordained Bishop | Jan Piotr Stepa † | Bishop of Tarnów, Poland |
20 May | 74.8 | Died | Enrico Gasparri † | Cardinal, Prefect of the Apostolic Signatura |
| Born | Brendan Kelly | | Bishop Emeritus of Galway and Kilmacduagh, Ireland |
21 May | 50.4 | Installed | Georges-Léon Landry † | Bishop of Hearst, Ontario, Canada | Bishop Emeritus |
51.0 | Appointed | Gerald Patrick Aloysius O’Hara † | Official to Romania | Apostolic Delegate to Great Britain |
22 May |
| Born | Francesco Montenegro | | Cardinal, Archbishop Emeritus of Agrigento, Italy |
23 May |
| Born | Lucio Lemmo | | Auxiliary Bishop Emeritus of Napoli {Naples}, Italy |
24 May |
| Born | Odon Marie Arsène Razanakolona | | Archbishop Emeritus of Antananarivo, Madagascar |
25 May |
| Born | Washington Cruz, C.P. | | Archbishop Emeritus of Goiânia, Goias, Brazil |
57.3 | Died | Gaspër Thaçi † | Archbishop of Shkodrë, Albania |
26 May | 17.1 | Professed | José Ramón Santos Iztueta Mendizábal, C.P. † | Member of Congregation of the Passion | Prelate Emeritus of Moyobamba, Peru |
24.4 | Ordained Priest | José de Jesús Sahagún de la Parra | Priest of Zamora, Michoacán, México | Bishop Emeritus of Ciudad Lázaro Cárdenas, Michoacán, México |
27 May | 77.2 | Died | Patrick Morrisroe † | Bishop of Achonry, Ireland |
28 May | 56.2 | Ordained Bishop | John Raphael Hagan † | Titular Bishop of Limata | Auxiliary Bishop of Cleveland, Ohio, USA |
| Born | Marcelino Hernández Rodríguez | | Bishop Emeritus of Colima, México |
| Born | Bosco Puthur | | Bishop Emeritus of Saint Thomas the Apostle of Melbourne (Syro-Malabar), Australia |
55.5 | Appointed | Giovanni Rizzo † | Auxiliary Bishop of Palermo, Italy | Archbishop Emeritus of Rossano, Italy |
55.5 | Appointed | Giovanni Rizzo † | Titular Bishop of Lysias | Archbishop Emeritus of Rossano, Italy |
29 May | 69.1 | Appointed | Massimo Massimi † | Cardinal, Prefect of the Apostolic Signatura |
40.0 | Installed | Giuseppe Siri † | Archbishop of Genova, Italy | Cardinal, Archbishop Emeritus of Genova-Bobbio, Italy |
30 May |
| Born | Michael August Blume, S.V.D. | | Apostolic Nuncio |
16.3 | Temporary Vows | Pellegrino Tomaso Ronchi, O.F.M. Cap. † | Member of Order of Friars Minor Capuchin | Bishop Emeritus of Città di Castello, Italy |
47.9 | Ordained Bishop | Charles Joseph van Melckebeke, C.I.C.M. † | Bishop of Yinchuan [Ningsia], China |
24.4 | Ordained Priest | Thomas Jerome Welsh † | Priest of Philadelphia, Pennsylvania, USA | Bishop Emeritus of Allentown, Pennsylvania, USA |
31 May | 55.9 | Appointed | Luigi Arrigoni † | Apostolic Nuncio to Peru |
55.9 | Appointed | Luigi Arrigoni † | Titular Archbishop of Apamea in Syria | Apostolic Nuncio to Peru |
| Born | Johannes Kreidler | | Auxiliary Bishop Emeritus of Rottenburg-Stuttgart, Germany |