Dietrich Mahnke (October 17, 1884, Verden – July 25, 1939, Fürth) was a German philosopher and historian of mathematics. From 1902–1906, Mahnke studied at Göttingen under Edmund Husserl and David Hilbert. After serving in the First World War (stationed in Lens, France), he graduated from the University of Freiburg in 1925 with a thesis on Leibniz. The thesis was later published in the Jahrbuch für Philosophie und phänomenologische Forschung as Leibnizens Synthese von Universalmathematik und Individualmetaphysik. In 1926 he habilitated at Greifswald with a thesis entitled Neue Einblicke in die Entdeckungsgeschichte der höheren Analysis. In 1927 he became a professor of philosophy at Marburg.