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- Marius Macrionitis, Archbishop of Athens
- Louis Maimbourg
- Juan de Mariana
- James Martin, author of My Life With the Saints and The Jesuit Guide to (Almost) Everything; culture editor for America magazine
- Malachi Martin, author of sixteen books, had three Ph.D's, spoke ten languages, much cloak and...
- Ignacio Martín-Baró, martyr of El Salvador
- Cardinal Carlo Maria Martini, Italian scripture scholar, Archbishop Emeritus of Milan
- Joseph Maréchal, Belgian transcendental philosopher
- Jacques Marquette, French explorer of the Mississippi and Northern Michigan areas
- William Francis Masterson, American educator to the Philippines; (Ateneo de Manila University, Xavier University - Ateneo de Cagayan), founder of the Xavier University - Ateneo de Cagayan College of Agriculture
- Saint Lèon-Ignance Mangin, martyred in China
- Blessed Julien Maunoir, 17th-century missionary to the Breton people
- Blessed Rupert Mayer, Servant of God, Resisted the Nazi's..
- John McElroy – One of two of the Army's first Catholic Chaplains. Chaplain during the Mexican-American War, founder of St. John's Literary Institute, Boston College High School, and Boston College.
- Horace McKenna, founder of So Others Might Eat and advocate of the Sursum Corda Cooperative
- John McLaughlin, American political commentator; left the Jesuits after a failed bid for a Senate seat in Rhode Island
- Anthony de Mello, Indian spiritual guide and writer
- Everard Mercurian, Belgian fourth Superior General of the Society of Jesus
- Saint Paul Miki, Japanese martyr
- Segundo Montes, martyr of El Salvador
- Saint Henry Morse, English martyr
- Simon Le Moyne, New World explorer
- John Courtney Murray, American theologian credited with the drafting of the Second Vatican Council Declaration on Religious Freedom
Read more about this topic: List Of Jesuits