Mike Fortner (born June 6, 1958) is a former Republican member of the Illinois House of Representatives, representing the 49th district. He has also been a researcher at Fermilab since 1987, and a professor at Northern Illinois University since 1993. Before election to the House, he had been the Mayor of West Chicago, Illinois. On November 7, 2006 he defeated Democratic candidate Dirk Enger, succeeding Randy Hultgren who was elected to the Illinois State Senate in the 48th district. He announced August 7, 2017 he would not seek reelection. In the election to succeed Fortner, Karina Villa defeated DuPage County Board member Tonia Khouri.Fortner holds a Ph.D. in physics from Brandeis University.