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- Gloria Macapagal-Arroyo - President of the Philippines (Georgetown University, Ateneo de Manila University)
- Charles Mackerras - Australian conductor (St Aloysius' College (Sydney))
- Gustavo Madero Muñoz - Mexican senator (Universidad Iberoamericana)
- Lisa Madigan - American attorney general (Loyola University Chicago School of Law)
- Michael Madigan - American politician (St. Ignatius College Prep, Chicago, Illinois)
- Ettore Majorana - Italian theoretical physicist (Istituto Massimo)
- Tak Wah Mak - Canadian immunologist, molecular biologist, and academic (Wah Yan College, Kowloon, Hong Kong)
- Louis Malle - French film director
- Jan Marek Marci - Bohemian mathematician (Jesuit college in Jindrichuv Hradec)
- Guido de Marco - former president of Malta (St Aloysius' College in Malta)
- Subcomandante Marcos (né Rafael Guillén) - Mexican leader of Zapatista Army (Instituto Cultural Tampico, Mexico)
- Wellington Mara - American football entrepreneur (Loyola School (New York, NY) and Fordham University)
- George Martin - British music producer (St Ignatius' College, Stamford Hill, N15; relocated to Enfield, Middlesex in the 1960s.)
- Ignacio Martín-Baró - Jesuit priest and liberation theologian (Pontifical Xavierian University)
- Fr. Ivan Mikhailovich Martynov, SJ - Russian Catholic priest and expositor of Slavic spiritual and cultural tradition (Brugelette and Laval)
- Chris Matthews - journalist (College of the Holy Cross)
- Roberto Matta - Chilean painter
- Fr. Juan Mateos, S.J. - author on spirituality and professor of Eastern Liturgy (Pontifical Oriental Institute)
- Drea de Matteo - Italian-American actress (Loyola School)
- Gregório de Mattos - major baroque poet of Brazil
- Theodore McCarrick - American Cardinal, Archbishop of Washington D.C. (Fordham Preparatory School)
- Dylan McDermott - Golden Globe Award-winning actor, best known for his roles on TV series The Practice and American Gothic
- Joe McGinniss - American author (College of the Holy Cross)
- William J. McGill - former President, Columbia University (Fordham University)
- John McLaughlin - American TV producer (Boston College)
- Joseph M. McLaughlin - Senior Appellate Judge, U.S. Second Circuit Court of Appeals (Brooklyn Prep, Fordham College and Fordham University School of Law)
- Gregan McMahon - Australian actor and playwright (St Ignatius' College, Riverview, Sydney)
- Mark McWatt - Guyanese and Caribbean author and poet (St. Stanislaus College, Guyana)
- Pierre Méchain - French astronomer and surveyor who contributed to the early study of deep sky objects and comets (educated by Jesuits in his birthplace of Laon)
- Thomas Patrick Melady - American ambassador; sub-cabinet officer; Senior Diplomat in Residence, The Institute of World Politics (Fordham University)
- Bob Menendez - American politician (Saint Peter's College, Jersey City, New Jersey)
- Lorenzo Mendoza - billionaire and CEO of Empresas Polar (Fordham University)
- Ismail Merchant - American/Indian film producer and director (Saint Xaviar's College, Mumbai(Bombay), India)
- Freddie Mercury - British musician (St. Mary's High School in Mazagaon)
- Marin Mersenne - French theologian, philosopher, mathematician and music theorist (Le Mans and Jesuit College of La Flèche)
- Franz Mesmer - German physician whose ideas spawned the development of hypnosis (University of Dillingen and University of Ingolstadt)
- John N. Mitchell - U.S. Attorney General under President Richard Nixon (Fordham University)
- Joseph Michel - French baroque composer (College of Godrans)
- Lakshmi Mittal - London-based Indian businessman and industrialist (St. Xavier's College in Calcutta)
- Dominique Moceanu - American gymnast (John Carroll University)
- Joe Moglia - Chairman and former CEO of TD Ameritrade (Fordham University)
- Molière - father of modern French literature (Collège de Clermont, Paris)
- Juan Molina - Chilean Jesuit and naturalist.
- Luca di Montezemolo - Italian businessman (Istituto Massimo)
- Mario Monti - Italian economist and politician (Istituto Leone XIII, Milan)
- Jean-Étienne Montucla - French mathematician (Jesuit College, Lyon)
- Michael Moriarty - American actor (University of Detroit Jesuit High School)
- Paul Morphy - American chess player (Spring Hill College)
- Massimo Moratti - Italian oil tycoon and owner of football club Inter Milan (Istituto Leone XIII, Milan)
- Andrew Morrison - Guyanese journalist and human rights advocate (St. Stanislaus College)
- George Moscone - Mayor of San Francisco, assassinated in office (St. Ignatius College Preparatory, San Francisco)
- Alonzo Mourning - American basketball player (Georgetown University)
- Julian Morrow - Australian comedian and radio host (St. Aloysius College)
- Robert Mugabe - President of Zimbabwe
- Bill Murray - American TV and movie star (Loyola Academy, Wilmette and Regis University)
- John Courtney Murray - American theologian (Xavier High, New York and Boston College)
- Joseph Murray - American surgeon and Nobel laureate (College of the Holy Cross)
- Dikembe Mutombo - basketball player from the Democratic Republic of the Congo (Georgetown University)
- Jason Miller - American playwright and actor (University of Scranton)
- Barbara Mikulski - United States senator of Maryland (Loyola College in Maryland)
- Anne M. Mulcahy - retired Chairman and CEO of Xerox and named one of the "50 Most Powerful Women in Business" in 2006 (Fordham University)
- Arthur Murphy - author, biographer and barrister, also known by the pseudonym Charles Ranger; coined the legal term "wilful misconstruction" (College of St. Omer)
- Kathleen A. Murphy - CEO of ING Wealth Management, 2007 Fortune 50 Most Powerful Women in Business (Fairfield University)
Read more about this topic: List Of Alumni Of Jesuit Educational Institutions