Olga Appell Avalos (born August 2, 1963, in Durango) is an American[1] long-distance runner from Mexico, best known for winning the gold medal in the women's marathon at the 1991 Pan American Games in Havana, Cuba.

She ran at the 1992 Summer Olympics the following year, but failed to finish the race.

She competed for Mexico until February 25, 1994, at which point she switched allegiance to the United States.

There she was eliminated in the qualifying heats of the women's 10,000 metres event.

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