The FIS Nordic World Ski Championships 2001 took place February 15–25, 2001 in Lahti, Finland for a record sixth time, previous events being held in 1926, 1938, 1958, 1978 and 1989. These championships also saw the most event changes since the 1950s with the 5 km women and 10 km men's events being discontinued, the 10 km women and 15 km men's events return to their normal status for the first time since the 1991 championships, the debut of a combined pursuit as a separate category, the addition of the individual sprint race for both genders, and the debut of the ski jumping team normal hill event. Extremely cold weather cancelled the women's 30 km event. The biggest controversy occurred when a doping scandal hit the host nation of Finland, resulting in six disqualifications. This would serve as a prelude to further doping cases in cross country skiing at the Winter Olympics in Salt Lake City the following year.

Jari Olavi Isometsä is a Finnish former cross-country skier who competed from 1990 to 2006. He won three bronze medals in the 4 × 10 km relay at the Winter Olympics.