Registry
- Helmut Lachenmann (1935 - None)
- Franz Lachner (1803 - 1890)
- Vinzenz Lachner (1811 - 1893)
- Édouard Lalo (1823 - 1892)
- Jacques-Michel Hurel de Lamare (1772 - 1823)
- Frederic Lamond (1868 - 1948)
- Geoffrey Lancaster (1954 - None)
- Víctor Mirecki Larramat (1847 - 1921)
- Ferdinand Laub (1832 - 1875)
- Franz Lauska (1764 - 1825)
- Albert Lavignac (1846 - 1916)
- Jean-François Le Sueur (1760 - 1837)
- Firmin Lebel (unknown - 1573)
- Louis Lebel (1831 - 1889)
- Nicolas Lebègue (1631 - 1702)
- Leonhard Lechner (c.1553 - 1606)
- Jerzy Lefeld (1898 - 1980)
- Giovanni Legrenzi (1626 - 1690)
- Hugo Leichtentritt (1874 - 1951)
- Karl Leimer (1858 - 1944)
- Jacques-Nicolas Lemmens (1823 - 1881)
- Leo Smith (1881 - 1952)
- Leonard Rose (1918 - 1984)
- Theodor Leschetizky (1830 - 1915)
- Jean-Henri Levasseur (1764 - 1823)
- Ernst Levy (1895 - 1981)
- Josef Lhévinne (1874 - 1944)
- Rosina Lhévinne (1880 - 1976)
- Peter Josef von Lindpaintner (1791 - 1856)
- Dinu Lipatti (1917 - 1950)
- Franz Liszt (1811 - 1886)
- Pietro Locatelli (1695 - 1764)
- Johann Bernhard Logier (1777 - 1846)
- Simon Lohet (c.1550 - 1611)
- Carlo Ambrogio Lonati (c.1645 - c.1712)
- Marguerite Long (1874 - 1966)
- Alessandro Longo (1864 - 1945)
- Achille Longo (1900 - 1954)
- Richard Loqueville (None - 1418)
- Clément Loret (1833 - 1909)
- Jan Willemszoon Lossy (1545 - 1629)
- Antonio Lotti (1667 - 1740)
- A. Lukinich (None - None)
- Jean-Baptiste Lully (1632 - 1687)
- Witold Lutosławski (1913 - 1994)
- Luzzasco Luzzaschi (c.1545 - 1607)
- Anatoly Lyadov (1855 - 1914)
- Hubert Léonard (1819 - 1890)
- Lazare Lévy (1882 - 1964)