| Main Entry | R | I | S | M | B | C | N |
| La Mettrie, Julien | X | ||||||
| Lacan, Jacques | X | ||||||
| Lachelier, J. | X | ||||||
| laissez-faire | X | ||||||
| Lakatos, Imre | X | ||||||
| Lakoff, George | X | ||||||
| Lamaism | X | ||||||
| Lamarck, Jean-Baptiste | X | ||||||
| Lambert, J. H. | X | ||||||
| Lamennais, R. | X | ||||||
| Lamettrie, Julien Offroy de | X | ||||||
| Lange, Friedrich Albert | X | X | |||||
| Langer, Suzanne | X | ||||||
| Language of Science | X | ||||||
| language of thought hypothesis | X | X | |||||
| Language, Functions of | X | ||||||
| Language, Philosophy of | X | ||||||
| Lao Tzu | X | ||||||
| Laozi | X | ||||||
| Laplace, P. S. de | X | ||||||
| Lassalle, Ferdinand | X | ||||||
| Latency | X | ||||||
| Latin-American Philosophy | X | ||||||
| Latitudinarianism | X | ||||||
| Lavoisier, Antoine-Laurent | X | ||||||
| Law | X | X | |||||
| Law and ideology | X | ||||||
| Law and language | X | ||||||
| Law of Population | X | ||||||
| Law, Chinese School of | X | ||||||
| law, natural | X | ||||||
| laws of nature | X | ||||||
| Laws of thought | X | ||||||
| Le Dœuff, Michèle | X | ||||||
| Leading principle | X | ||||||
| learning theory, formal | X | ||||||
| legal obligation and authority | X | ||||||
| Legal Philosophy | X | ||||||
| _economic analysis of law | X | ||||||
| legal positivism | X | ||||||
| legal reasoning | |||||||
| _interpretation and coherence | X | ||||||
| legal rights | X | ||||||
| legalism | X | ||||||
| Legalism, ethical | X | ||||||
| Le Grand, Antoine | X | ||||||
| Lehrer, Keith | X | ||||||
| Lei | X | ||||||
| Leibniz, Gottfried Wilhelm | X | X | X | X | |||
| Leibniz -- causation | X | ||||||
| Leibniz -- ethics | X | ||||||
| Leibniz -- philosophy of mind | X | ||||||
| Leibniz -- problem of evil | X | ||||||
| Lemma | X | ||||||
| Lenin, V. I. | X | X | |||||
| Lessing, Gotthold Ephraim | X | X | |||||
| Leucippus | X | X | X | X | |||
| Level | X | ||||||
| Levy-Bruhl, Lucien | X | ||||||
| Lewis, Clarence Irving | X | X | |||||
| lex talionis | X | ||||||
| lexical definition | X | ||||||
| Li | X | ||||||
| Li hsueh | X | ||||||
| liar paradox | X | ||||||
| Liberal Arts, The Seven | X | ||||||
| liberalism | X | X | |||||
| Libertarianism | X | X | |||||
| libertas | X | ||||||
| Liberty | X | ||||||
| Liberty, positive and negative | X | ||||||
| Liberum Arbitrium | X | ||||||
| libraries | X | ||||||
| libraries, ancient Greek and Roman | X | ||||||
| Lichtenberg, Georg Christoph | X | ||||||
| Lieh Tzu | X | ||||||
| life | X | X | |||||
| Limit | X | ||||||
| Limitative | X | ||||||
| Limiting Notion | X | ||||||
| Limits of Sensation | X | ||||||
| Line of Beauty | X | ||||||
| Lipps, Theodor | X | ||||||
| Lipsius, Justus | X | ||||||
| Lobachevsky, N. I. | X | ||||||
| Localization, Cerebral | X | ||||||
| Locke, John | X | X | X | X | |||
| locutionary act | X | ||||||
| logic | X | X | |||||
| logic, Aristotle's | X | ||||||
| logic, classical | X | X | |||||
| logic, deontic | X | ||||||
| logic, formal | X | ||||||
| logic, fuzzy | X | ||||||
| logic and games | X | ||||||
| logic, history of | X | ||||||
| logic, inductive | X | ||||||
| logic, infinitary | X | ||||||
| logic, informal | X | ||||||
| logic, intuitionistic | X | ||||||
| logic, many-valued | X | ||||||
| logic, modal | X | X | |||||
| logic, non-monotonic | X | ||||||
| logic and ontology | X | ||||||
| logic, para-consistent | X | ||||||
| logic, provability | X | ||||||
| logic, relevance | X | ||||||
| logic, substructural | X | ||||||
| logic, symbolic | X | ||||||
| logic, temporal | X | ||||||
| logic, traditional | X | ||||||
| logical atomism | |||||||
| logical atomism, Wittgenstein's | X | ||||||
| logical consequence | X | ||||||
| logical constants | X | ||||||
| logical constructions | X | ||||||
| Logical Empiricism | X | ||||||
| logical form | X | X | |||||
| Logical machines | X | ||||||
| Logical meaning | X | ||||||
| Logical Positivism | X | X | X | X | |||
| Logical truth | X | ||||||
| logicism | X | ||||||
| logicization of arithmetic | X | ||||||
| Logistic | X | ||||||
| Logistic system | X | ||||||
| Logomachy | X | ||||||
| Logos | X | ||||||
| logos / mythos (logos / muqos) | X | ||||||
| Lombard, Peter | X | X | X | ||||
| long term memory | X | ||||||
| Lorenz, Konrad | X | ||||||
| Lotze, Rudolph Hermann | X | X | X | X | |||
| Love | X | X | |||||
| Lovejoy, Arthur O. | X | X | |||||
| Löwenheim's theorem | X | ||||||
| Lu Hsiang-shan | X | ||||||
| luck -- justice and bad luck | X | ||||||
| luck, moral | X | ||||||
| Lucretius, Carus | X | X | X | X | |||
| Lukacs, Gyorgy | X | ||||||
| Lukasiewicz, Jan | X | ||||||
| Lullic art | X | ||||||
| Lumen naturale | X | ||||||
| Lutheranism | X | ||||||
| Luxemburg, Rosa | X | ||||||
| Lvov-Warsaw School | X | ||||||
| Lyotard, Jean-Francois | X | ||||||
| Lyric | X |