Nils Emanuel Karlsson, better known as Mora-Nisse, was a Swedish cross-country skier. Karlsson won gold in the 50 km event at the 1948 Winter Olympics and nine Vasaloppet victories.

Vasaloppet is an annual long distance cross-country ski race held on the first Sunday of March. The 90 km (56 mi) course starts in the village of Berga, just south of Sälen in western Dalarna, Sweden, and ends in the town of Mora in the central part of the province. It is the oldest cross-country ski race in the world, as well as the one with the highest number of participants.