John Mark Harrington (born 1956) is the Commissioner of the Minnesota Department of Public Safety for the U.S. State of Minnesota, appointed by Governor Tim Walz. He has served since January 2019. Harrington previously served as Chief of the Saint Paul Police Department (2004-2010) and Chief of the Metro Transit Police (2012-2019) in Minneapolis–Saint Paul. He is a former member of the Minnesota Senate who represented District 67, which includes portions of the city of Saint Paul in Ramsey County. A Democrat, he is a teacher and manager at Metropolitan State University in Saint Paul.