Wolfgang Smith (born February 18, 1930) is a mathematician, physicist, philosopher of science, metaphysician, Roman Catholic and member of the Traditionalist School. He has written extensively in the field of differential geometry, as a critic of scientism and as a proponent of a new interpretation of quantum mechanics that draws heavily from medieval ontology and realism. The End of Quantum Reality, a documentary film about his life and thought, ran in a limited national theatrical release in the U.S. in early 2020.