William Conrad Koch (born June 7, 1955) is an American cross-country skier who competed at the international level.

At the age of 12, Koch met noted cross-country skier Bob Gray, who taught him how to train effectively.

When the family moved to England, Koch attended Aiglon College, a boarding school in Switzerland, for a year.

The next year, the family returned to Vermont, and it became expeditious for Koch to attend the Putney School, where he could pursue his interest in cross-country skiing.

After his athletic career, he consulted in the construction of cross-country ski courses in Frisco, Colorado; Cable, Wisconsin; and Labrador City, Newfoundland.

(Canada's Sara Renner would become the second when she earned a bronze medal in the individual sprint at the 2005 FIS Nordic World Ski Championships in Oberstdorf.)