Mark McCormack (born September 15, 1970, Plymouth, Massachusetts) is a professional cyclo-cross and road bicycle racer from the United States.
McCormack became the first rider to hold the U.S. national championship in cyclo-cross and road bicycle racing in a career.
On Monday November 12, 2012, McCormack took first place in one, if not the, first ever "fat tire" bicycle race at the Coonemesset Farms Eco-Cross in Falmouth, Massachusetts.
The organizers required that all participant's bicycles had a tire width no narrower than 3.5".
This biographical article relating to American cycling is a stub.