Oscar Gjøslien (November 9, 1909 – May 20, 1995) was a Norwegian cross-country skier who competed during the 1930s.
He won a bronze medal at the 1939 FIS Nordic World Ski Championships in the 50 km.
In 1935, Gjøslien won the 50 km cross-country skiing event at the Holmenkollen ski festival.
Because of his successes, Gjøslien was awarded the Holmenkollen medal in 1940 (shared with Annar Ryen).