Petra Henzi (born 14 October 1969 in Küttigen, Aargau) is a retired Swiss professional mountain biker.
Throughout her sporting career, she has won numerous Swiss national championship titles, and more importantly, a total of four prestigious medals (one gold, one silver, and two bronze) in women's cross-country race at the UCI Mountain Bike World Championships.
Henzi later represented her nation Switzerland, as a 38-year-old senior, at the 2008 Summer Olympics, and also rode professionally for more than five seasons on Fischer-BMC Team, before retiring from the sport in early 2010.