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- Stepan Malkhasyants (Armenia, 1857–1947) Armenian language historical dictionary
- Francis Andrew March (USA, 1825–1911) comparative linguistics, English language historical dictionary
- Francis Mason (UK/USA/Burma, 1799–1874) Burmese language
- Percy C. Mather (UK/China, 1882–1933) Mongolian language dictionary
- Robert Henry Mathews (Australia/China, 1877–1970) Chinese and English bilingual dictionary
- Johann Mattheson (Germany, 1681–1764) music, German language
- Erin McKean (USA, born 1971) English language general and LSP dictionary
- Lambert McKenna (Ireland, 1870–1956) English and Irish bilingual dictionary
- Walter Henry Medhurst (UK/China, 1796–1857) Chinese and English bilingual dictionary
- Igor Mel'čuk (Russia/Canada, 1932-) French dictionary
- Wilhelm Meyer-Lübke (Switzerland/Germany, 1861–1936) Romance languages
- Minamoto no Shitagō (Japan, 911–983) Japanese language thesaurus
- William Chester Minor (Sri Lanka/USA/UK, 1834–1920) English language historical dictionary
- John Minsheu (UK, 1560–1627) Spanish and English bilingual dictionary, 11-language multilingual dictionary
- María Moliner (Spain, 1900–1981) Spanish language general dictionary
- Judah Monis (USA, 1683–1764) Hebrew language
- Paul Monroe (USA, 1869–1947) English language encyclopedic dictionary
- Morohashi Tetsuji (Japan, 1883–1982) Chinese and Japanese bilingual dictionary
- Robert Morrison (UK/China, 1782–1834) Chinese and English bilingual dictionary
- Mahshid Moshiri (Iran, ?– ) Persian language pronunciation and LSP dictionaries
- Joseph Moxon (UK, 1627–1691) English LSP dictionary
- Kārlis Mīlenbahs (Latvia, 1853–1916) Latvian and German bilingual dictionary
- Wilhelm Max Müller (Germany/USA, 1862–1919) Hebrew language dictionary
- Pamela Munro (USA, born 1947) Native American language dictionaries
- James Murray (UK, 1837–1915) English language historical dictionary
- Vladimir Müller (Russia, 1880–before 1943) English–Russian dictionary
Read more about this topic: List Of Lexicographers