Mark Mahon (born April 8, 1957) is a former Representative in the House of Representatives of the U.S. state of Florida. As of July 2015, was Interim Chief Judge of Florida's 4th Circuit Court. He resides in Jacksonville, Florida. Mahon received his bachelor's degree from the Florida State University in 1978. In addition, he received his Juris Doctorate from Florida State University in 1981. In 2007, he was appointed by governor Charlie Crist as a circuit judge for the 4th Judicial Circuit of Jacksonville, Florida. This ended his term as a Representative of the 16th District of Florida.