| Living Prelates (Total 5656) * |
  Bishop Paul James Mason (63), Military Ordinary of Great Britain (England) |
 Bishop Simon Chibuga Masondole (53), Bishop of Bunda (Tanzania) |
  Archbishop Georges Masri (57), Metropolitan Archbishop of Aleppo of the Greek-Melkites (Syria) |
  Bishop James Massa (65), Titular Bishop of Bardstown and Auxiliary Bishop of Brooklyn (USA) |
  Archbishop Angelo Massafra, O.F.M. (77), Metropolitan Archbishop emeritus of Shkodrë–Pult (Albania) |
 Archbishop Francesco Massara (60), Archbishop of Camerino–San Severino Marche (Italy) and Bishop of Fabriano–Matelica (Italy) |
| Bishop Giovanni Massaro (58), Bishop of Avezzano (Italy) |
| Archbishop Isaac Amani Massawe (74), Metropolitan Archbishop of Arusha (Tanzania) |
  Bishop Vital Massé (89), Bishop emeritus of Mont-Laurier (Canada) |
 Bishop Osmany Massó Cuesta (49), Bishop of Bayamo y Manzanillo (Cuba) |
 Bishop Janusz Edward Mastalski (61), Titular Bishop of Noba and Auxiliary Bishop of Kraków (Poland) |
 Bishop Juan Abelardo Mata Guevara, S.D.B. (79), Bishop emeritus of Estelí (Nicaragua) |
| Bishop Salvatore Ronald Matano (79), Bishop emeritus of Rochester (USA) |
 Archbishop Paul Youssef Matar (85), Archbishop emeritus of Beirut of the Maronites (Lebanon) |
 Bishop Woldeghiorghis Matheos (85), Titular Bishop of Turuda and Vicar Apostolic emeritus of Hosanna (Ethiopia) |
 Bishop Gerald John Mathias (72), Bishop of Lucknow (India) |
  Cardinal Dominique Joseph Mathieu, O.F.M. Conv. (62), Cardinal-Priest of S. Giovanna Antida Thouret, Archbishop of Tehran–Isfahan (Iran) and President of Iranian Episcopal Conference |
 Bishop Jean-Paul Mathieu (85), Bishop emeritus of Saint-Dié (France) |
| Bishop Yvan Mathieu, S.M. (65), Titular Bishop of Vazari and Auxiliary Bishop of Ottawa–Cornwall (Canada) |
 Bishop Alexander Matiz Atencio (65), Bishop of Buga (Colombia) and Apostolic Administrator of Buenaventura (Colombia) |
 Bishop Maksimilijan Matjaž (62), Bishop of Celje (Slovenia) |
 Bishop Juan Matogo Oyana, C.M.F. (76), Bishop emeritus of Bata (Equatorial Guinea) |
 Bishop Yanuarius Teofilus Matopai You (65), Bishop of Jayapura (Indonesia) |
 Bishop Teodor Matsapula, I.V.E. (44), Bishop of Mukačeve of the Ruthenians (Ukraine) |
 Bishop Michael Gorō Matsuura (ミカエル 松浦悟郎) (73), Bishop of Nagoya 名古屋 (Japan) |
 Archbishop Youssef Matta (57), Archbishop of Akka of the Greek-Melkites (Israel) |
| Bishop Paul Mattekatt (64), Bishop of Diphu (India) |
| Archbishop Antonio Mattiazzo (85), Archbishop-Bishop emeritus of Padova (Italy) |
 Bishop Juozas Matulaitis-Labukas (88), Bishop emeritus of Kaišiadorys (Lithuania) |
| Bishop François-Paul-Marie Maupu (86), Bishop emeritus of Verdun (France) |
 Archbishop Miguel Maury Buendía (70), Titular Archbishop of Italica and Apostolic Nuncio to Great Britain |
 Archbishop Jonáš Jozef Maxim, M.S.U. (51), Metropolitan of Prešov of the Slovaks (Slovakia) and President of Council of the Slovak Church |
 Bishop Mihály Mayer (85), Bishop emeritus of Pécs (Hungary) |
 Bishop Renato Pine Mayugba (70), Bishop of Laoag (Philippines) |
 Archbishop Luciano Maza Huamán (68), Metropolitan Archbishop of Piura (Peru) |
 Bishop Adimir Antônio Mazali (59), Bishop of Erexim (Brazil) |
 Bishop Vusumuzi Francis Mazibuko, O.M.I. (60), Vicar Apostolic of Ingwavuma (South Africa) |
 Bishop Samir Mazloum (91), Titular Bishop of Callinicum of the Maronites |
| Bishop José Mazuelos Pérez (65), Bishop of Islas Canarias (Spain) |
| Bishop Jerzy Mazur, S.V.D. (72), Bishop of Ełk (Poland) |
| Bishop Meron Mazur, O.S.B.M. (64), Bishop of Imaculada Conceição em Prudentópolis of the Ukrainians (Brazil) |
| Bishop Carlo Mazza (84), Bishop emeritus of Fidenza (Italy) |
| Bishop Giuseppe Mazzafaro (71), Bishop of Cerreto Sannita–Telese–Sant’Agata de’ Goti (Italy) |
 Bishop Marcelo Fabián Mazzitelli (65), Titular Bishop of Pauzera, Auxiliary Bishop of Mendoza (Argentina) and Apostolic Administrator of San Rafael (Argentina) |
| Archbishop Andrea Bruno Mazzocato (77), Metropolitan Archbishop emeritus of Udine (Italy) |
 Bishop Samuel Mbairabé Tibingar (53), Bishop of Koumra (Chad) |
 Archbishop Jean Mbarga (69), Metropolitan Archbishop of Yaoundé (Cameroon) |
| Bishop Philippe Alain Mbarga (58), Bishop of Ebolowa (Cameroon) and Vice-President of National Episcopal Conference of Cameroon |
 Bishop Joseph Ndembu Mbatia (64), Bishop of Nyahururu (Kenya) |
 Archbishop Gabriel Mbilingi, C.S.Sp. (68), Metropolitan Archbishop of Lubango (Angola) |
 Bishop José-Claude Mbimbi Mbamba (63), Bishop of Boma (Congo-Kinshasa) |
| Bishop John Mbinda, C.S.Sp. (52), Bishop of Lodwar (Kenya) |
 Bishop Smaragde Mbonyintege (79), Bishop emeritus of Kabgayi (Rwanda) |
| Bishop Cyprien Mbuka Nkuanga, C.I.C.M. (82), Bishop emeritus of Boma (Congo-Kinshasa) |
| Bishop Thulani Victor Mbuyisa, C.M.M. (53), Bishop of Kokstad (South Africa) and Apostolic Administrator of Mthatha (South Africa) |
| Bishop Louis Mbwôl-Mpasi, O.M.I. (95), Bishop emeritus of Idiofa (Congo-Kinshasa) |
| Bishop Paul McAleenan (74), Titular Bishop of Mercia and Auxiliary Bishop of Westminster (England) |
 Bishop John McAreavey (77), Bishop emeritus of Dromore (Northern Ireland) |
| Bishop Scott McCaig, C.C. (60), Military Ordinary of Canada (Canada) |
| Bishop James Francis McCarthy (83), Titular Bishop of Verrona and Auxiliary Bishop emeritus of New York (USA) |
 Bishop Michael Fabian McCarthy (75), Bishop emeritus of Rockhampton (Australia) |
| Bishop Robert John McClory (62), Bishop of Gary (USA) |
| Bishop John Joseph McDermott (63), Bishop of Burlington (USA) |
| Archbishop Kevin John Patrick McDonald (78), Metropolitan Archbishop emeritus of Southwark (England) |
| Cardinal Robert Walter McElroy (72), Cardinal-Priest of S. Frumenzio ai Prati Fiscali and Metropolitan Archbishop of Washington (USA) |
 Bishop Brian McGee (60), Bishop of Argyll and The Isles (Scotland) and Vice-President of Bishops’ Conference of Scotland |
| Archbishop Michael George McGovern (61), Metropolitan Archbishop of Omaha (USA) |
| Bishop William Terrence McGrattan (69), Bishop of Calgary (Canada) |
| Bishop Alexander Aloysius McGuckian (Alan), S.J. (73), Bishop of Down and Connor (Northern Ireland) |
| Bishop Robert Michael McGuckin (82), Bishop emeritus of Toowoomba (Australia) |
| Bishop John Joseph McIntyre (62), Titular Bishop of Bononia and Auxiliary Bishop of Philadelphia (USA) |
| Bishop Michael Joseph McKenna (74), Bishop of Bathurst (Australia) |
| Bishop Andrew McKenzie (61), Bishop of Dunkeld (Scotland) |
| Bishop Donal McKeown (76), Bishop of Derry (Northern Ireland) |
| Bishop Patrick Joseph McKinney (71), Bishop of Nottingham (England) |
| Archbishop William Shawn McKnight (57), Metropolitan Archbishop of Kansas City (USA) |
| Archbishop Malcolm Patrick McMahon, O.P. (76), Metropolitan Archbishop emeritus of Liverpool (England) and former Vice-President of Bishops’ Conference of England and Wales |
| Bishop Robert Joseph McManus (74), Bishop of Worcester (USA) |
| Bishop Titus Joseph Mdoe (65), Bishop of Mtwara (Tanzania) |
 Abbot Mauro Meacci, O.S.B. (70), Abbot Ordinary of Subiaco (Italy) |
| Bishop Daniel Joseph Meagher (64), Bishop of Rockhampton (Australia) |
| Bishop Tesfaselassie Medhin (Tesfay) (73), Bishop of Adigrat of the Ethiopics (Ethiopia) |
| Bishop Ignacio Damián Medina (59), Bishop of Río Gallegos (Argentina) |
| Bishop Germán Medina Acosta (68), Bishop of Engativá (Colombia) and General Secretary of Episcopal Conference of Colombia |
 Bishop Mario Medina Balam (63), Titular Bishop of Pupiana and Auxiliary Bishop of Yucatán (Mexico) |
| Bishop Herculano Medina Garfias (58), Bishop of Ciudad Guzmán (Mexico) |
 Bishop Mario Melanio Medina Salinas (86), Bishop emeritus of San Juan Bautista (Paraguay) |
| Bishop William Francis Medley (73), Bishop of Owensboro (USA) |
 Bishop Marko Medo (54), Bishop of Gospić–Senj (Croatia) |
| Bishop Leonardo Yuzon Medroso (87), Bishop emeritus of Tagbilaran (Philippines) |
 Bishop Bertram Johannes Meier (65), Bishop of Augsburg (Germany) |
| Bishop Dominicus Meier, O.S.B. (66), Bishop of Osnabrück (Germany) |
| Bishop Mario Meini (79), Bishop emeritus of Fiesole (Italy) |
| Bishop-elect Sean Buslig Mejia (54), Vicar Apostolic of Tabuk (Philippines) |
| Bishop Cristóbal Bernardo Mejía Corral (71), Bishop of Chulucanas (Peru) |
| Archbishop Omar de Jesús Mejía Giraldo (60), Metropolitan Archbishop of Florencia (Colombia) |
| Bishop Edgar Jesús Mejía Orozco (50), Titular Bishop of Zattara and Auxiliary Bishop of Barranquilla (Colombia) |
| Bishop Rodrigo Mejía Saldarriaga, S.J. (87), Titular Bishop of Vulturia and Vicar Apostolic emeritus of Soddo (Ethiopia) |
 Bishop Fausto Ramón Mejía Vallejo (84), Bishop emeritus of San Francisco de Macorís (Dominican Republic) |
| Bishop Gerardo Melgar Viciosa (77), Bishop emeritus of Ciudad Real (Spain) |
