Susan DeMattei (born October 15, 1962) is an American former professional cross-country mountain bike racer.

[1][6][7] She first became interested in cycling while attending California State University, Chico, where she was pursuing her nursing degree.

[1] DeMattei was a talented climber, and almost immediately after taking up cycling, she was setting local road hillclimb records with times out of reach of most of the male competitors.

[1] DeMattei won the silver medal in the cross-country class at the 1994 UCI Mountain Bike World Championships in Vail, Colorado.

[8] DeMattei married former professional mountain bike racer and teammate, Dave Wiens.