L (35 madde)
- La Mettrie, Julien Offray de
- Laelius Socinus
- Lagrange. Joseph-Louis
- Laissez-faire
- Lamarck, Jean-Baptiste
- Laplace, Pierre-Simon
- Latin-Cermen dünyası
- Latin İbnirüşdçülüğü
- Latin Patristiği
- Latince
- Lavoisier, Antoine
- Lefevre, Jacques
- Leibniz, Gottfried Wilhelm
- Leibniz-Wolff felsefesi
- Leonardo da Vinci
- Leontinoi
- Lesboslu Pittakos
- Lessing, Gotthold Ephraim
- Leukippos
- Leviathan
- lex Dei
- lex natura
- liberalizm
- Lidya Kralı Kroisos
- Livius
- Locke, John (1632-1704)
- logistikon
- Logos
- logos spermatikos
- lojik
- Luther, Martin
- Luthercilik
- lütuf
- Lyell, Charles
- Lykeion