William Demong (born March 29, 1980, in Vermontville, New York) is an American former Nordic combined skier and Olympic gold medalist.

Demong is a five-time Olympian, having competed in Nagano, Salt Lake City, Torino, Vancouver and Sochi.

[5] After the medal ceremony held later that evening for the 10 km individual large hill event, Demong proposed to his girlfriend, Katie Koczynski, in front of teammates and coaches at the team headquarters near Vancouver.

[6] Also on that same day, Demong found out he was named the flagbearer for the American team at the closing ceremony of the 2010 Winter Olympics on February 28.

He attended the National Sports Academy during high school, and competed in the Nagano Olympics during his senior year.