Pat Hennen (born April 27, 1953 in Phoenix, Arizona) is an American former Grand Prix motorcycle road racer.
He is best known for being the first American to win a 500 cc World Championship race, the 1976 500cc Finnish Grand Prix.
Competing as a non-factory rider, he finished third overall in the GP World Championship standings that season, only 2 points behind runner-up Tepi Länsivuori and fellow Suzuki factory rider Barry Sheene.When competing in the 1978 Isle of Man TT races, he suffered career-ending injuries after recording the first ever sub-20 minute lap on a 500 cc Suzuki in the Senior TT.