John R. Lausch Jr. is an American attorney who served as the United States attorney for the Northern District of Illinois from 2017 to 2023. Previously, he served as an Assistant United States Attorney in the Northern District of Illinois from 1999 to 2010. During his time in the U.S. Attorney's Office, he served as a Deputy Chief in the Narcotics and Gangs Section for several years, where he helped lead the District's Anti-Gang and Project Safe Neighborhoods programs.