James Ronald Ryun is an American former track athlete and politician, who was a Republican member of the United States House of Representatives from 1996 to 2007, representing the 2nd District in Kansas. In the 2006 election, Ryun was defeated by Democratic challenger Nancy Boyda. In the Kansas Republican primary on August 5, 2008, he was defeated by Kansas State Treasurer Lynn Jenkins.
Years prior to his political career, Ryun had an athletic career that saw him become a world-class runner and the last American to hold the world record in the mile run. His career was highlighted by many world record times and a silver medal in the 1500 m at the 1968 Mexico City Olympics.