Peter Wust (28 August 1884, Rissenthal – 3 April 1940, Münster) was a German existentialist philosopher.
Wust was born the oldest of eleven children in Rissenthal in Saarland. He attended the local public school, then the Friedrich-Wilhelm-Gymnasium in Trier. Though his parents had hoped he would become a Catholic priest, he decided on studying Geisteswissenschaft. After 1907, Wust pursued German studies, English studies, and philosophy in Berlin and Strasbourg. He taught in Berlin, Neuss, Trier, and Cologne, and earned his doctorate in 1914 from the University of Bonn.
Under the influence of Max Scheler, Wust, originally a neo-Kantian, moved toward Christian existentialism, a development in which the burgeoning Renouveau catholique, the originally French effort to modernize and enlighten traditional, conservative Catholicism, played an important part. In 1928, in Paris, Wust met Georges Bernanos, Paul Claudel, and Jacques Maritain. He developed close friendships with the editors of the Munich-based Catholic monthly Hochland, Carl Muth and Otto Gruendler, maintaining an "intense" correspondence with them and publishing six essays in the magazine between 1922 and 1926.