Hans Pichler (; 26 February 1882, Leipzig â 10 November 1958, Bonn) was a German philosopher. A student of Windelband and Meinong, he revived in his work the philosophy of Wolff contra the epistemologism of the neo-Kantians, particularly in his ÃÂber Christian Wolffs Ontologie (1910). Among those influenced by Pichler's turn to realist ontology was Nicolai Hartmann.