Jon Fossum (23 February 1923 – 10 July 2007) was a Norwegian orienteer and politician for the Conservative Party. He was born at Hvalstad. In his younger days he was an active sportsman, representing Asker SK. In addition to ski jumping and cross-country skiing, he competed in orienteering. In the latter sport he won five national championships; three of which in relay races with his two brothers. In 2008 a road at was named after him.