Creator
- Landes, Richard1
- Landrum, G. W.1
- Landsberger, Herbert1
- Larson, Bon C.1
- Le Chatelier, Henri, 1850-19361
- Lee, Frank C.1
- Legion of Alien Volunteer Blood Donors1
- Leiner, Oskar1
- Leskov, N. S. (Nikolaĭ Semenovich), 1831-18951
- Levis, Otto1
- Levy, Lydia R.1
- Lewis, Gilbert Newton, 1875-19461
- Liddell, D. M.1
- Liebermann, Carl, 1842-19141
- Liesegang, Raphael Eduard, 1869-19471
- Lindsey, W.C.1
- Lintner, Karl Josef Ludwig (1855-1926)1
- Lippmann, Edmund O. von (Edmund Oskar), 1857-19401
- Loeb, Carl M.1
- Loeb, Lotta1