Stephanos Bibas (born 1969) is an American lawyer and jurist who serves as a judge on the U.S. Court of Appeals for the Third Circuit. Before his appointment to the bench, Bibas was a professor of law and criminology and director of the Supreme Court clinic at the University of Pennsylvania Law School. He is a noted scholar of criminal procedure with expertise in criminal charging, plea bargaining, and sentencing. As a professor, Bibas examined how procedural rules written for jury trials have unintended consequences when cases involving jury trials are the exception, rather than the rule, with 95 percent of defendants pleading guilty. Bibas also studied the role of substantive goals such as remorse and apology in criminal procedure.