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Paul Gerhard Natorp (24 January 1854 – 17 August 1924) was a German philosopher and educationalist, considered one of the co-founders of the Marburg school of neo-Kantianism. He was known as an authority on Plato.
Paul Natorp was born in Düsseldorf, the son of the Protestant minister Adelbert Natorp and his wife Emilie Keller. From 1871 he studied music, history, classical philology and philosophy in Berlin, Bonn and Strasbourg. He completed his dissertation in 1876 in Strasbourg under the supervision of the philosopher Ernst Laas and in 1881 completed his Habilitation under the Neo-Kantian Hermann Cohen. In 1885 he became extraordinary professor and in 1893 became ordinary professor in philosophy and pedagogy at Marburg University, a position he retained until his retirement in 1922. In the winter semester of 1923-24 Natorp conducted an intensive exchange of ideas with Martin Heidegger, who had been called to Marburg and whose work on Duns Scotus Natorp had read very early on. In 1887 he married his cousin Helene Natorp; they had five children. Natorp was an ambitious composer, who wrote chiefly chamber music (including a cello sonata, a violin sonata, and a piano trio). He also wrote some 100 songs and two choral works. He conducted a correspondence with Johannes Brahms, who dissuaded him from becoming a professional composer.
He was an influence on the early work of Hans-Georg Gadamer and had a profound effect upon the thought of Edmund Husserl, the "father" of phenomenology. His students included the philosopher and historian Ernst Cassirer, the chemist Otto Hahn and the author of Doctor Zhivago, Boris Pasternak.
- Descartes' Erkenntnistheorie. Eine Studie zur Vorgeschichte des Kriticismus. 1882. E-Book: Berlin 2014, ISBN 978-3-944253-04-6
- Sozialpädagogik (1899)
- Logik in Leitsätzen (1904)
- Gesammelte Abhandlungen zur Sozialpädagogik (3 volumes, 1907)
- Pestalozzi. Leben und Lehre (1909)
- Die logischen Grundlagen der exakten Wissenschaften (1910)
- Philosophie; ihr Problem und ihre Probleme (1911), new edition: Edition Ruprecht, Göttingen 2008 (ed. and introduction by Karl-Heinz Lembeck), ISBN 978-3-7675-3055-3
- Sozialidealismus (1920)
- Beethoven und wir (1920)
- "Platos Ideenlehre" (1921)
- Allgemeine Logik (in: Flach und Holzhey, Erkenntnistheorie und Logik im Neukantianismus, 1979)
- Paul Natorp's Philosophy of Religion within the Marburg Neo-Kantian Tradition (1980) Judy Deane Saltzmann
- L'École de Marbourg : Cohen, Natorp, Cassirer (1989) Alexis Philonenko
- Platon in Marburg: Platon-Rezeption Und Philosophiegeschichtsphilosophie Bei Cohen Und Natorp (1994) Karl-Heinz Lembeck
- Paul Natorp et la Théorie Platonicienne des Idées (2004) Julien Servois