Odd-Willy Martinsen (born 20 December 1942) is a retired Norwegian cross-country skier who competed during the 1960s and 1970s.

For his cross-country skiing successes in Norway and abroad, Martinsen received the Holmenkollen medal in 1969.

Thirty-two years later, his daughter, Bente Skari, received the Holmenkollen medal, making them the only father-daughter combination to ever win the prestigious honor.

After retiring from competitions he became a skiing official and headed the FIS cross-country committee in 1986–2002.

At the 1994 Winter Olympics in Lillehammer, he served as chief of the cross-country skiing competitions.