Ernst Laas (/lɑːs/; German: [laːs]; June 16, 1837, Fürstenwalde – July 25, 1885, Strasbourg) was a German gymnasium teacher, philosopher of positivism and education, and chair of philosophy and pedagogy at the University of Strasbourg. The insights he found in the history of philosophy and philosophies based on sensualism are key aspects of his scholarly work.