Simon "Simi" Ammann (; 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.