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- George de La Hèle (1547–1586)
- André Laporte (born 1931)
- Eduard Lassen (1830–1904)
- Orlandus Lassus (c. 1532–1594)
- Jacques Leduc (born 1932)
- Victor Legley (1915–1994)
- Guillaume Lekeu (1870–1894)
- Jacques-Nicolas Lemmens (1823–1881)
- Nicholas Lens (born 1957)
- Jacques Loeillet (1685–1748)
- Jean Baptiste Loeillet of Ghent (1688–c. 1720)
- Jean-Baptiste Loeillet of London (John Loeillet) (1680–1730)
- Carolus Luython (1557–1620)
Read more about this topic: List Of Belgian Classical Composers