Fritz Medicus (April 23, 1876 – January 13, 1956) was a German-Swiss philosopher.
He was awarded his doctorate while studying in Jena, with the publication of his dissertation, Kant's transcendental aesthetics and non-euclidian geometry.
He was the Chair of Philosophy at the Martin Luther University of Halle-Wittenberg, and moved to ETH Zurich in 1911.
Medicus wrote in the tradition of German idealism.