Mary Mairs Chapot (*June 20, 1944 in Pasadena, CA, USA) married Frank Chapot in 1965. She was the first woman to win a Pan American Games Gold Medal and the first woman (with Kathy Kusner) to ride for the USA in the Olympic Games (in Tokyo 1964).
Internationally, Chapot achieved her greatest success riding the great mare Tomboy. In 1963, the pair won individual and team Gold Medals at the Pan American Games in Sao Paulo, Brazil; in 1965, they won the first U.S. Grand Prix, in Cleveland. Riding White Lightning, Chapot earned a team Silver Medal at the 1967 Pan American Games in Winnipeg. She rode on twenty-two winning Nations Cup squads. Her many individual triumphs include the Imperial Cup, John Player Cup, and Queen Elizabeth Cup in England, in addition to wins at Lucerne, Essen, Wiesbaden, and Ostend. She won consistently on the North American indoor circuit from 1962 through 1968, and she won the Grand Prix at The National Horse Show in 1966 and 1968.