Simon Ammann (/ˈsiːmɒn/; born 25 June 1981) is a Swiss ski jumper. He is one of the most successful athletes in the history of the sport, having won four individual Winter Olympic gold medals, in 2002 and 2010, and is the only ski jumper to have achieved the gold double–double at the Winter Olympics. His other achievements include winning the 2007 Ski Jumping World Championships, the 2010 Ski Flying World Championships, the 2010 Nordic Tournament, and the 2010 Ski Jumping World Cup overall title.
Ammann made his debut as a 16-year-old rookie during the 1997–1998 Ski jumping World Cup season. Ammann qualified for the 1998 Olympic Games in Nagano, Japan, where he finished 35th.
Prior to the 2002 Winter Olympics in Salt Lake City, Ammann crashed and suffered injuries during training in Willingen. Despite this, he won a gold medal in both the individual normal hill and large hill competitions, being only the second athlete to accomplish this feat (Matti Nykänen having done so in 1988). Following the Olympics, Ammann became a star in Switzerland and also made appearances on American talk shows, such as the Late Show with David Letterman (on 20 February 2002).