Ernst Freund (born January 30, 1864 in New York City – died October 20, 1932 in Chicago, Illinois) was a noted American legal scholar. He received a Dr. Jur. from the University of Heidelberg (1884) and a Ph.D. in political science from Columbia University (1897). He was professor of political science at the University of Chicago (1894–1902) and then professor of law at Chicago (1903–1932), serving as the John P. Wilson Professor of Law (1929–1932). Freund was principally responsible for the development of administrative law in the United States during the early twentieth century. He was one of the organizers of the Immigrants' Protective League (1908). The University of Chicago Law School has established the Ernst Freund Distinguished Service Professorship of Law and Ethics in his honor, a seat currently held by philosopher Martha Nussbaum.