Álvaro Mejía Florez (born May 15, 1940 in Medellín, Antioquia) is a former long-distance runner from Colombia, who became a national hero after competing in the 1964 Tokyo Olympic Games 5,000 meter final.
Mejía competed in the 1968 Mexico City Olympics in the 10,000 meters, where he placed tenth, and in the 1972 Munich Olympics, where he ran the marathon.
Mejía also won the 1971 Boston Marathon in two hours, eighteen minutes and 45 seconds.
He won a bronze medal at the 1971 Pan American Games in the 10,000 metres.
Mejia was won the Saint Silvester Road Race in 1966.