The FIS Nordic World Ski Championships 1966 took place 17–27 February 1966 in Oslo, Norway at the Holmenkollen ski arena. This was the third time the Norwegian capital hosted this event having done so in 1930 and at the 1952 Winter Olympics. This also equaled the most times a city had hosted with Lahti, Finland and Zakopane, Poland.

Gjermund Eggen was a Norwegian cross-country skier who won three gold medals at the 1966 FIS Nordic World Ski Championships. The championships were held in Oslo in conjunction with the Holmenkollen ski festival, and so Eggen's medals also counted as Holmenkollen victories. He was awarded the Holmenkollen medal in 1968. He competed at the 1968 Winter Olympics in the 30 km event, but finished only 34th. Eggen died in Elverum at age 77.