Ana Gabriela Guevara Espinoza (b. March 4, 1977) is a Mexican track and field athlete, specializing in the 400 meters.

Guevara was born in Nogales, Sonora. She won her first gold medal in the 1999 Pan American Games in Canada. In the 2000 Sydney Olympics she came in 5th place. After that she won 28 consecutive international races before a second-place finish in Rome in July 2004. On August 27, 2003, she set her personal record for the 400m, running it 48.89 seconds in Paris, France. In 2003, she won the International Association of Athletics Federations' Golden League in women's 400m. The IAAF also ranked her first in the same event from 2003 to 2004. She also is leader of the Mexican 400m women's relay team. She won a silver medal at the Athens Olympic Games in the 400m final.