Louis Auguste Paul Rougier (French: [ʁuʒje]; 10 April 1889 – 14 October 1982) was a French philosopher. Rougier made many important contributions to epistemology, philosophy of science, political philosophy and the history of Christianity.
Rougier was born in Lyon. Debilitated by pleurisy in his youth, he was declared unfit for service in World War I and devoted his adolescence to intellectual pursuits.
After receiving the agrégation de philosophie degree from the University of Lyon, Rougier taught until 1924 at various lycées and obtained his doctorate from the Sorbonne in 1920. His doctoral thesis work was published that year as La philosophie géometrique de Poincaré and Les paralogismes du rationalisme. Rougier already had several publications to his name, however, beginning with a 1914 paper on the use of non-Euclidean geometry in relativity theory.
Rougier taught in Algiers from 1917 to 1920 and then in Rome from 1920 to 1924. His first university appointment in France was at the University of Besançon in 1925, where he served on the faculty until his dismissal in 1948 for political reasons. Further university appointments were in Cairo from 1931–36, the New School for Social Research from 1941–43 and the Université de Montréal in 1945. Rougier's final academic appointment was to the Université de Caen in 1954, but he retired at the age of 66 after only one year there.