Laënnec,
René Théophile Hyacinthe Landsteiner,
Karl Laveran,
Charles Louis Alphonse Lederberg,
Joshua Leishman,
William Boog Lejeune,
Jérôme Jean Louis Marie Levi-Montalcini,
Rita Lewis,
Edward B. Li,
Cho Hao Linacre,
Thomas Lipmann,
Fritz Lister,
Joseph, 1st Baron Lister Loewi,
Otto Lorenz,
Konrad (Zacharias) Ludwig,
Karl Friedrich Wilhelm Luria,
Salvador Edward Lwoff,
André Michael Lynen,
Feodor (Felix Konrad) Lysenko,
Trofim Denisovich