Ivar Formo (24 June 1951 – 26 December 2006) was a Norwegian cross-country skier who competed during the 1970s. He won four medals at the Winter Olympics. Formo also won two bronze medals at the FIS Nordic World Ski Championships in the 4 x 10 km relay (1974, 1978). Formo also competed in orienteering, winning a bronze medal in the relay at the 1974 world championships.
He represented the club SFK Lyn. He won a number of awards for his accomplishments within sports, notably the Holmenkollen medal in 1975 (shared with Gerhard Grimmer and his good friend and rival Oddvar Brå) and Egebergs Ærespris in 1973.
In 1979 he was part of the Lyn Jukola orienteering relay winning team.
After retiring as an athlete he had a successful career as a businessman, and served as chairman of the cross-country committee (1983–1988) in the International Ski Federation. Formo earned an engineering degree, and was chairman of the board of Ignis at the time of his death.
Formo was found drowned in the lake Store Sandungen in Nordmarka, the forests surrounding Oslo. He had gone jogging and skating through the area and had most likely fallen through the ice.