Didier Défago (born 2 October 1977) is a Swiss retired World Cup alpine ski racer.

Born in Morgins, Valais, Défago made his World Cup debut at age 18 in March 1996, and was Swiss national champion in downhill (2003) and giant slalom (2004).

[2] He was the first to win these in consecutive weeks since Stephan Eberharter in 2002, and the first Swiss racer since Franz Heinzer in 1992.

While training on a glacier above Zermatt in mid-September 2010, Defago fell and injured ligaments in his left knee, ending his 2011 season.

[3] Défago announced his retirement in March 2015, after a second-place finish at the World Cup finals in the downhill in Méribel, France, and had his final World Cup race the next day in the super-G.[4]