| Bishops |
  Bishop Angelo Mascheroni (94)
Titular Bishop of Foro Flaminio
Auxiliary Bishop emeritus of Milano (Italy)
| Born: | 1929.10.13 (Sesto San Giovanni, Italy) | | Ordained Priest: | 1952.06.07 | | Consecrated Bishop: | 1990.06.24 |
| Priest of Milano (Italy) (1952.06.07 – 1990.06.09) Auxiliary Bishop of Milano (Italy) (1990.06.09 – 2005.01.10) Titular Bishop of Foro Flaminio (1990.06.09 – ...) |
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 Bishop Jan Chrzciciel Louis Masclet, O.M.
| Born: | 1762.09.04 (France) | | Ordained Priest: | 1787.12.22 | | Consecrated Bishop: | 1817.06.24 | | Died: | 1836.07.11 († 73) |
| Titular Bishop of Camachus (1814.09.26 – 1836.07.11) Auxiliary Bishop of Minsk (Belarus) (1814.09.26 – 1836.07.11) |
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Archbishop Pietro Mashad (Maronite Rite) |
Bishop Giuseppe Masi (Italo-Albanese Rite) | Born: | 1826.01.12 | | Consecrated Bishop: | 1878.04.28 | | Died: | 1903.04.11 († 77) |
| Titular Bishop of Tempe (1878.01.29 – 1903.04.11) Ordinary of Silicia of the Italo-Albanese (Italy) (1878.01.29 – 1903.04.11) |
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  Bishop James Massa (64)
Titular Bishop of Bardstown
Auxiliary Bishop of Brooklyn (USA)
Ut omnes unum sint | Born: | 1960.09.03 (Jersey City, NJ, USA) | | Ordained Priest: | 1986.10.25 | | Consecrated Bishop: | 2015.07.20 |
| Priest of Brooklyn (USA) (1986.10.25 – 2015.05.19) Titular Bishop of Bardstown (2015.05.19 – ...) Auxiliary Bishop of Brooklyn (USA) (2015.05.19 – ...) |
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Archbishop Renato Massa | Born: | 1691.11.04 (Italy) | | Ordained Priest: | 1715.08.04 | | Consecrated Bishop: | 1727.01.05 | | Died: | 1744.06.13 († 52) |
| Bishop of Rimini (Italy) (1726.12.16 – 1744.06.13) Titular Archbishop of Sebastia (1741.04.17 – 1744.06.13) |
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Archbishop Youssef Massad (Maronite Rite) |
 Archbishop Joannice Massamiri (Greek-Melkite Rite)
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 Bishop Charles Massé
| Born: | 1877.08.21 (France) | | Ordained Priest: | 1903.04.11 | | Consecrated Bishop: | 1938.11.09 | | Died: | 1969.05.08 († 91) |
| Auxiliary Bishop of Luçon (France) (1938.07.27 – 1940.01.30) Titular Bishop of Phæna (1938.07.27 – 1969.05.08) |
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Bishop Arcangelo Massi Apostolic Administrator of Fermo (Italy) (1406.01.06 – 1406.01.22) |
Archbishop Vincenzo Massi | Born: | 1781.07.22 | | Ordained Priest: | 1805.06.23 | | Consecrated Bishop: | 1821.07.01 | | Died: | 1841.01.10 († 59) |
| Bishop of Gubbio (Italy) (1821.06.27 – 1839.11.22) Titular Archbishop of Thessalonica (1839.11.22 – 1841.01.10) |
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 Bishop Guillaume-Clément Masson, M.E.P.
| Born: | 1801.04.01 (France) | | Ordained Priest: | 1823.12.20 | | Consecrated Bishop: | 1848.12.03 | | Died: | 1853.07.24 († 52) |
| Titular Bishop of Laranda (1848.05.23 – 1853.07.24) Coadjutor Vicar Apostolic of Southern Tonking (Vietnam) (1848.05.23 – 1853.07.24) |
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Archbishop Vincentius Massoni | Born: | 1808.01.22 (Italy) | | Ordained Priest: | 1830.09.18 | | Consecrated Bishop: | 1856.07.06 | | Died: | 1857.06.03 († 49) |
| Titular Archbishop of Edessa (1856.06.19 – 1857.06.03) Apostolic Internuncio to Brazil (1856.06.19 – 1857.06.03) Apostolic Delegate to Argentina (1856.06.19 – 1857.06.03) |
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 Bishop Janusz Edward Mastalski (60)
Titular Bishop of Noba
Auxiliary Bishop of Kraków (Poland)
Dominus spes mea | Born: | 1964.05.04 (Kraków, Poland) | | Ordained Priest: | 1989.05.21 | | Consecrated Bishop: | 2019.01.05 |
| Priest of Kraków (Poland) (1989.05.21 – 2018.12.03) Titular Bishop of Noba (2018.12.03 – ...) Auxiliary Bishop of Kraków (Poland) (2018.12.03 – ...) |
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Archbishop Luigi Matera | Born: | 1820.02.11 (Italy) | | Ordained Priest: | 1845.12.21 | | Consecrated Bishop: | 1882.07.17 | | Died: | 1891.11.29 († 71) |
| Apostolic Delegate to Argentina (1880.04 – 1884.10) Titular Archbishop of Irenopolis (1882.03.30 – 1891.11.29) |
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 Archbishop David Mathew
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 Bishop Yvan Mathieu, S.M. (63)
Titular Bishop of Vazari
Auxiliary Bishop of Ottawa–Cornwall (Canada)
Noli timere | Born: | 1961.03.07 (Québec, QC, Canada) | | Ordained Priest: | 1987.08.15 | | Consecrated Bishop: | 2022.06.13 |
| Titular Bishop of Vazari (2022.03.17 – ...) Auxiliary Bishop of Ottawa–Cornwall (Canada) (2022.03.17 – ...) |
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Bishop Josip Matić | Titular Bishop of Risinium (1859 – 1876) |
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Bishop Ivan Matizović | Titular Bishop of Risinium (1837.04.13 – 1848) |
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 Bishop Kajetán Matoušek
| Born: | 1910.08.07 (Czechia) | | Ordained Priest: | 1934.12.22 | | Consecrated Bishop: | 1949.09.17 | | Died: | 1994.10.21 († 84) |
| Auxiliary Bishop of Praha (Czechia) (1949.08.29 – 1992.06.05) Titular Bishop of Serigene (1949.08.29 – 1994.10.21) |
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Archbishop Basilio Matranga, O.S.B.M. | Titular Bishop of Dionysias (1715.08.19 – 1726.10.07) Titular Archbishop of Acrida (1726.10.07 – 1748.04.07) |
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Bishop Martino Matronola, O.S.B. Cas. | Born: | 1903.11.02 (Italy) | | Ordained Priest: | 1929.09.29 | | Consecrated Bishop: | 1977.05.08 | | Died: | 1994.05.20 († 90) |
| Provost of Atina (Italy) (1971.05.24 – 1977.03.21) Abbot Ordinary of Montecassino (Italy) (1971.05.24 – 1983.01.08) Titular Bishop of Turres in Numidia (1977.03.21 – 1994.05.20) |
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Archbishop Orazio Mattei | Born: | 1724.08.02 (Italy) | | Ordained Priest: | 1759.06.09 | | Consecrated Bishop: | 1767.10.04 |
| Titular Archbishop of Colossæ (1767.09.28 – ?) |
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Bishop Matteo Titular Bishop of Bethlehem (1506.11.21 – 1511?) |
 Bishop Juozas Matulaitis-Labukas
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Bishop Pascase Maupair, O.P. | Titular Bishop of Selymbria (1533.09.03 – 1551?) |
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Bishop Basilio Maupretis, O.F.M. | Consecrated Bishop: | 1439.12.13 |
| Titular Bishop of Tanis (1439.11.11 – ?) |
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Bishop Giovanni Mauri | Born: | 1854.03.01 (Italy) | | Ordained Priest: | 1876.09.23 | | Consecrated Bishop: | 1904.12.07 | | Died: | 1936.11.13 († 82) |
| Titular Bishop of Famagusta (1904.11.14 – 1936.11.13) Auxiliary Bishop of Milano (Italy) (1904.11.14 – 1936.11.13) |
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Archbishop Antonio Mauro |
 Bishop Dominik Mayer
| Born: | 1809.01.08 | | Ordained Priest: | 1834.07.22 | | Consecrated Bishop: | 1863.12.13 | | Died: | 1875.05.04 († 66) |
| Titular Bishop of Cisamus (1863.10.01 – 1875.05.04) Military Vicar of Austria (Austria) (1863.10.01 – 1875.05.04) |
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 Bishop Johann Bernhard Mayer
| Born: | 1669.11.04 | | Ordained Priest: | 1694.12.18 | | Consecrated Bishop: | 1705.03.01 | | Died: | 1747.09.07 († 77) |
| Titular Bishop of Chrysopolis in Arabia (1705.01.26 – 1747.09.07) Auxiliary Bishop of Würzburg (Germany) (1705.01.26 – 1747.09.07) |
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Bishop Laurentius Mayer | Born: | 1828.07.26 (Austria) | | Ordained Priest: | 1853.08.05 | | Consecrated Bishop: | 1899.01.22 | | Died: | 1912.05.13 († 83) |
| Titular Bishop of Dioclea (1899.01.11 – 1912.05.13) Auxiliary Bishop of Wien (Austria) (1899.01.11 – 1912.05.13) |
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 Bishop Theophilus Mayer, M.H.M.
| Born: | 1854.01.02 (Canada) | | Ordained Priest: | 1876.12.03 | | Consecrated Bishop: | 1894.11.04 | | Died: | 1900.09.09 († 46) |
| Titular Bishop of Arcadiopolis (1894.07.31 – 1900.09.09) Auxiliary Bishop of Madras (India) (1894.07.31 – 1900.09.09) |
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Bishop Jakob Mayr Deus caritas | Born: | 1924.07.24 (Austria) | | Ordained Priest: | 1950.07.09 | | Consecrated Bishop: | 1971.05.20 | | Died: | 2010.09.19 († 86) |
| Auxiliary Bishop of Salzburg (Austria) (1971.03.12 – 2001.08.15) Titular Bishop of Agbia (1971.03.12 – 2010.09.19) |
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Bishop Rupert Mayr | Born: | 1810.08.13 | | Ordained Priest: | 1834.08.01 | | Consecrated Bishop: | 1869.11.14 | | Died: | 1873.07.27 († 62) |
| Titular Bishop of Paneade (1869.10.22 – 1873.07.27) Auxiliary Bishop of Salzburg (Austria) (1869.10.22 – 1873.07.27) |
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 Bishop José Tomás Mazarrasa y Rivas
| Born: | 1823.03.07 (Spain) | | Consecrated Bishop: | 1885.04.19 | | Died: | 1907.03.11 († 84) |
| Titular Bishop of Philippopolis (1885.02.21 – 1907.03.11) Apostolic Administrator of Ciudad Rodrigo (Spain) (1885.03.27 – 1907.03.11) |
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 Bishop Samir Mazloum (90) (Maronite Rite)
Titular Bishop of Callinicum of the Maronites
| Born: | 1934.09.10 (Kaakour, Lebanon) | | Ordained Priest: | 1964.06.07 | | Consecrated Bishop: | 1997.01.11 |
| Titular Bishop of Callinicum of the Maronites (1996.11.11 – ...) Bishop of Curia of the Maronites (2000 – 2011.08.13) |
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 Bishop Jerônimo Mazzarotto
| Born: | 1898.04.11 (Brazil) | | Ordained Priest: | 1921.04.24 | | Consecrated Bishop: | 1957.07.21 | | Died: | 1999.05.23 († 101) |
| Auxiliary Bishop of Curitiba (Brazil) (1957.04.29 – 1970.05.08) Titular Bishop of Arsinoë in Arcadia (1957.04.29 – 1999.05.23) |
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Archbishop Giuseppe Mazzetti, O. Carm. | Born: | 1778.12.02 (Italy) | | Consecrated Bishop: | 1836.07.16 | | Died: | 1850.07.14 († 71) |
| Bishop of Aquino (Italy) (1836.07.11 – 1838.02.05) Bishop of Pontecorvo (Italy) (1836.07.11 – 1838.02.15) Bishop of Sora (Italy) (1836.07.11 – 1838.02.15) Titular Archbishop of Seleucia Trachea (1838.02.15 – 1850.07.14) |
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 Bishop Marcelo Fabián Mazzitelli (64)
Titular Bishop of Pauzera
Auxiliary Bishop of Mendoza (Argentina)
Que todos sean uno | Born: | 1960.06.25 (Buenos Aires, Argentina) | | Ordained Priest: | 1986.03.11 | | Consecrated Bishop: | 2017.12.29 |
| Priest of San Isidro (Argentina) (1986.03.11 – 2017.11.10) Titular Bishop of Pauzera (2017.11.10 – ...) Auxiliary Bishop of Mendoza (Argentina) (2017.11.10 – ...) |
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Archbishop Giuseppe Mazzoli | Born: | 1886.11.22 (Italy) | | Ordained Priest: | 1911.07.09 | | Consecrated Bishop: | 1935.03.19 | | Died: | 1945.12.08 († 59) |
| Titular Archbishop of Germa in Hellesponto (1934.12.15 – 1945.12.08) Apostolic Delegate to Bulgaria (1934.12.15 – 1945.12.08) |
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