Olav Dufseth (December 19, 1917 – September 22, 2009) was a Norwegian nordic combined and cross-country skier who competed in the 1940s.
Dufseth finished eighth in the Nordic combined event at the 1948 Winter Olympics at St. Moritz. In the 18 kilometre cross-country skiing event he finished 18th.
He was born in Vang, Hedmark and represented the club Vang SF. He died in September 2009 in Rena.