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- Jef Maes (1905–1996)
- Désiré Magnus (1828–1884)
- Pieter van Maldere (1729–1768)
- Louis Marischal (born 1928)
- Jacques Martin (1851–1930)
- Philibert Mees (1929–2006)
- Martin-Joseph Mengal (1784–1851)
- Wim Mertens (born 1953)
- Guilielmus Messaus (1589–1640)
- Arthur Meulemans (1884–1966)
- Jos Moerenhout (1909–1985)
- Jérôme-Joseph de Momigny (1762–1842)
- Philippus de Monte (1521–1603)
- Lodewijk Mortelmans (1868–1952)
Read more about this topic: List Of Belgian Classical Composers