Ephraim S. London (June 17, 1911 – June 12, 1990) was an American attorney and law professor specializing in constitutional law who established a reputation as a defender of free speech and civil liberties. He taught constitutional law at the New York University School of Law, his alma mater. He wrote The World of Law, a textbook that was widely used in law schools. He was also the author of The Law as Literature.