 Saint Mateo Alonso de Leciñana y Alonso, O.P. |
 Saint Mateo Correa Magallanes |
 Blessed Mateo Despons Tena Born:1884.04.05 (San Mateo, Maestrazgo, Castellón, Spain)Died:1936.08.13 🩸 (Maestrazgo, Castellón, Spain † 52)Beatified:2013.10.13 (Tarragona, Spain)Priest of Diocesan Labourer Priests of the Sacred Heart of Jesus. Martyr. |
| Blessed Mateo Garolera Masferrer, S.D.B. |
| Blessed Mateo López López Born:1911.01.01 (Vera, Almería, Spain)Ordained Priest:1935.03.16Died:1938.11.02 🩸 (Vera, Almería, Spain † 27)Beatified:2017.03.25 (Almería, Spain)Priest of Almería. Martyr. |
| Blessed Mateu Casals Mas, C.M.F. |
 Saint Mateus Moreira Layperson of Natal. Martyr. |
 Blessed Mateusz, O.P. |
| Saint Mateusz, O.S.B. |
 Blessed Mathieu-Henri Planchat, R.S.V. |
 Saint Mathilde von Ringelheim Layperson. Queen of East Francia. |
 Saint Mathurin de Larchant |
| Blessed Mathurin-Nicolas de la Villecrohain le Bous de Villeneuve, S.J. |
| Blessed Mathurin-Victoir Deruelle |
 Blessed Mati, O.F.M. Pal Prennushi (secular name) |
| Blessed Matías Cardona Meseguer, Sch. P. |
| Blessed Matías Espeso Cuevas, O.E.S.A. |
| Blessed Matías Manuel Albert Ginés |
| Blessed Matías Morín Ramos, O.H. |
| Blessed Matilde del Sagrado Corazón Matilde Téllez Robles (secular name)Religious and founder of Daughters of Mary Mother of the Church. |
 Saint Matrona of Ankara |
| Saint Matrona of Thessalonica |
| Blessed Matteo, O.P. Giovanni Francesco Carreri (secular name) |
| Blessed Matteo Guimerà, O.F.M. |
 Blessed Matthaeus Alvarez Anjin マテオ・アルバレス (日本語)Layperson of Nagasaki. Member of Lay Dominicans and Secular Franciscans. Martyr. |
 Blessed Matthaeus Choe In-gil 최인길 마티아 (한국어)崔仁吉 (正體中文) |
| Blessed Matthaeus Kim Hyeon-u 김현우 마태오 (한국어)金顯禹 (正體中文) |
| Saint Matthaeus Kohyōe, O.P. マテオ・デル・ロザリオ小兵衛 (日本語) |
| Blessed Matthaeus Yu Jung-seong 유중성 마태오 (한국어)柳重誠 (正體中文) |
| Saint Matthêô Lê Văn Gẫm |
| Saint Matthêô Nguyễn Văn Đắc (Phượng) |
| Saint Matthew Apostle of Jesus Christ. Evangelist. Martyr. |
 Blessed Matthew Flathers |
 Blessed Matthew Lambert Maitiú Laimpeart (Gaeilge)Layperson of Ferns. Martyr. |
| Blessed Matthias マチアス (日本語)Layperson of Nagasaki. Catechist. Member of Confraternity of the Rosary. Martyr. |
 Saint Matthias Apostle. Replacement for Judas Iscariot. Martyr. |
| Blessed Matthias Araki Hyōzaemon マチアス荒木 (日本語) |
| Blessed Matthias Choe Yeo-gyeom 최여겸 마티아 (한국어)崔汝謙 (正體中文) |
| Saint Matthias de Miyako マチアス (日本語)Layperson of Nagasaki. Member of Secular Franciscans. Martyr. |
 Saint Matthias Feng De 馮德．穆迪 (正體中文) |
| Blessed Matthias Itō Hikosuke マチアス 彦助 (日本語) |
 Saint Matthias Kalemba Mulumba Wante Matiya (Kiswahili) |
| Blessed Matthias Kozasa マチアス小坂 (日本語)Layperson of Nagasaki. Member of Confraternity of the Rosary. Martyr. |
| Blessed Matthias Nakano マチアス申野 (日本語)Layperson of Nagasaki. Member of Confraternity of the Rosary. Martyr. |
| Blessed Matthias Pak Sang-geun 박상근 마티아 (한국어) |
| Blessed Matthias Shōbara Ichizaemon マチアス 庄原 市左衛門 (日本語) |
| Blessed Mattia Nazareni, O.S.C. |
| Blessed Maturin-Marie Pitri, O. Cist. |
| Saint Maudez |
| Blessed Maur, O.P. |
| Saint Maur de Bodon |
| Saint Maur de Glanfeuil, O.S.B. |
 Saint Maura |
| Saint Maurand de Douai, O.S.B. |
| Saint Maure |
| Saint Maure de Troyes |
 Saint Maurice d’Agaune Layperson. Commander of the Theban legion. Martyr. |
| Saint Maurice Duault de Carnoët, O. Cist. |
| Blessed Maurice Mackenraghty Muiris Mac Ionrachtaigh (Gaeilge) |
| Blessed Maurice Tornay, C.R.B. 杜仲賢 (正體中文) |
| Blessed Mauricio Íñiguez de Heredia Alzola, O.H. |
 Saint Mauricius |
| Blessed Maurilio del Niño Jesús, C.P. Murilio Macho Rodríguez (secular name) |
| Blessed Maurilio Tobar González, C.M. |
| Saint Maurin d’Agen Layperson. Evangelist of the rural population. Martyr. |
| Saint Mauro, O.S.B. |
 Saint Mauro |
| Saint Mauro, O.S.B. |
| Saint Mauro |
| Saint Mauro de Valencia Died:283 🩸 (Valencia, Spain)Layperson. Martyr. |
| Saint Mauro di Roma Layperson. Child. Martyr. |
| Blessed Mauro Palazuelos Maruri, O.S.B. |
| Saint Mauront de Marchiennes, O.S.B. |
| Max Josef Metzger |
| Saint Maxellende de Caudry Maxellendis (Italiano) |
| Saint Maxien de Beauvais |
 Saint Máxima |
| Saint Maxima |
 Saint Maxima |
| Blessed Máxima de San José, A.A.S.C. Emilia Echeverría Fernández (secular name)Born:1881.04.05 (Dicastillo, Navarra, Comunidad Foral de Navarra, Spain)Died:1936.11.10 🩸 (Madrid, Spain † 55)Beatified:2007.10.28Religious of Sisters Adorers Handmaids of Charity and of the Blessed Sacrament. Martyr. |
| Saint Maxime |
| Saint Maximian Layperson. One of the Seven Sleepers of Ephesus. Martyr. |
| Saint Maximiano |
| Saint Maximilian Kolbe, O.F.M. Conv. Maksymilian Maria Kolbe |
| Saint Maximilian of Tebessa Born:274Died:295.03.12 🩸 (Thavaste, Algeria † 20)Feast:03.12Layperson. Roman soldier. Martyr. |
| Saint Maximin de Besançon |
| Blessed Maximino Fernández Marínas, O.P. |
| Saint Maximinus Layperson. Imperial guard of Emperor Julian. Companion of Saint Juventinus. Martyr. |
| Blessed Máximo, S.P. ad V. José Franco Ruiz (secular name) |
| Blessed Máximo Valle García, O.E.S.A. |
 Saint Maximos |
| Saint Maximus |
| Saint Maximus |
 Saint Maximus |
 Saint Maximus |
| Saint Maximus |
| Saint Maximus Died:III century? 🩸 (Caesarea in Cappadocia, Turkiye)Feast:11.19Chorbishop. Martyr. |
 Saint Maximus of Constantinople |
| Saint Maximus of Rome |
| Saint May de Bodon |
| Saint Mbaga Tuzinde |
| Saint Mechthild von Hackeborn, O.S.B. |
| Blessed Medart, O.P. |
| Saint Medimnus |
| Saint Méen Born:540? (Gwent, France)Died:617.06.21 (Saint-Méen-le-Grand, France † 76)Feast:06.21Abbot. |
 Saint Meinhard, C.R.S.A. |
| Saint Meinrad von Einsiedeln |
| Saint Meinuph Deacon. Founder of abbey of Bodeken. |
| Saint Melania the Elder Religious. Grandmother of Saint Melania the Younger. |
| Saint Melania the Younger |
| Saint Melanippus of Nicaea |
| Saint Melapsippus |
| Blessed Melchior Kumagai Motonao メルキョル 熊谷豊前守 元直 (日本語) |
| Saint Melchizedek King of Salem and priest. |
| Blessed Melchor de San Agustín Sánchez Pérez, O.A.R. |
| Blessed Melchor del Espíritu Santo, O.SS.T. Melchor Rodríguez Villastrigo (secular name) |
| Blessed Melchor del Niño Jesús, O.C.D. Melchor Martín Monge (secular name) |
| Blessed Melchor Martínez Antuña, O.E.S.A. |
| Blessed Melchora Adoración Cortés Bueno, F.d.C. Born:1894.05.04 (Sos del Rey Católico, Spain)Died:1936.08.12 🩸 (Puerta de Hierro, Aravaca, Madrid, Spain † 42)Beatified:2013.10.13 (Tarragona, Spain)Religious of Daughters of Charity. Martyr. |
| Blessed Melecio Pardo Llorente, C.M.F. |
 Saint Melichar Grodecki, S.J. Menyhért Grodziecki (Magyar) |
| Blessed Melitón Martínez Gómez Born:1878.03.10 (Jérez del Marquesado, Granada, Spain)Ordained Priest:1901.06.01Died:1936.09.18 🩸 (Cuesta de la Reina, Nacimiento, Almería, Spain † 58)Beatified:2017.03.25 (Almería, Spain)Priest of Guadix. Martyr. |
| Saint Memmia |
| Saint Memnon |
| Saint Menander of Prusa |
| Saint Menas of Egypt |
| Blessed Mencia メンシア (日本語)Layperson of Kyoto. Widow. Martyr. |
| Saint Ménehould Manechilde (Italiano) |
| Saint Ménelée de Menat |
| Saint Menignus Layperson. Fuller. Martyr. |
| Saint Menna del Sannio |
| Saint Menulphe |
 Blessed Mercedes Molina y Ayala, R.M. Religious and founder of Institute of the Sisters of St. Mary Ann of Jesus. |
| Saint Mercuria |
| Saint Mercurius Born:225? (Eskentos in Cappadocia, Turkiye)Died:250.12.04 🩸 (Caesarea in Cappadocia, Turkiye † 24)Feast:11.25Layperson. Roman soldier. Martyr. |
| Saint Merry Médéric (français) |
| Saint Mesme Chinon |
| Saint Mesmin Memorius (latine) |
| Saint Mesmin de Micy, O.S.B. |
| Saint Mesrop Mashtots (Armenian Rite) Monk. Inventor of the Armenian alphabet. |
| Saint Messaire |
 Saint Methodius Michael (secular name) |
| Blessed Metod, C.SS.R. Dominik Trčka (secular name) |
| Saint Metranus of Alexandria |
| Saint Metrone |
| Saint Mexme |