L'Ecluse, Charles de (1525–1609)

L'Esperance, Elise (c. 1878–1959)

L'Hôpital, Guillaume Francois Antoine (1661–1704)

L'Obel, Matthias de (c. 1538–1616)

Labov, William

Labuza, Theodore P (1940– )

Lacaille, Nicolas Louis de (1713–1762)

Lack, David (1910–1973)

Laënnec, René Théophile Hyacinthe (1781–1826)

Lagrange, Joseph Louis (1736–1813)

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Laithwaite, Eric Roberts (1921–1997)

Lakatos, Imre (1922–1974)

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Lalande, Joseph Jérome le Français de (1732–1807)

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Lambert, Walter Davis (1879–1968)

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Lamont, Johann von (1805–1879)

Lanchester, Frederick William (1868–1946)

Lancisi, Giovanni Maria (1654–1720)

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Landé, Alfred (1888–1976)

Landsberg, Helmut Erich (1906–1985)

Landsteiner, Karl (1868–1943)

Langer, Robert S.

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Langevin, Paul (1872–1946)

Langley, John Newport (1852–1925)

Langley, Samuel Pierpoint (1834–1906)

Langmuir, Irving (1881–1957)

Lanier, Jaron (1960– )

Lankester, Edwin Ray (1847–1929)

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Lapworth, Arthur (1872–1941)

Lapworth, Charles (1842–1920)

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Laue, Max Theodor Felix von (1879–1960)

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Lauterbur, Paul Christian (1929–2007)

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Lederman, Leon (1922– )

Ledley, Robert Steven (1926–2012)

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Lee, Tsung Dao (Lee, Tsung Dao)

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Lefkowitz, Robert Joseph (1943– )

Lefschetz, Solomon (1884–1972)

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Lehmann, Phyllis (1912–2005)

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Leonardo da Vinci (1452–1519)

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Lindemann, Frederick Alexander (1886–1957)

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Lindley, John (1799–1865)

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Lovell, (Alfred Charles) Bernard (1913–2012)

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Ludwig, Carl Friedrich Wilhelm (1816–1895)

Lumière (Lumière)

Lummer, Otto Richard (1860–1925)

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Lysenko, Trofim Denisovich (1898–1976)

Lyttleton, Raymond Arthur (1911–1995)