Jacqueline Gareau (born March 10, 1953) is a Canadian runner who won the Boston Marathon on April 21, 1980. Gareau led the women's field for most of the race, only to find another runner, Rosie Ruiz, wearing the traditional victor's laurels when she crossed the finish line. Ruiz was later disqualified after it was determined she had not run the entire race, and Gareau was awarded the victory in a special ceremony one week later. Her official time for the 1980 marathon, 2:34:28, was the fastest time recorded for a woman in the event's history at the time.