Álvaro Mejía Castrillón (born January 19, 1967, in Santa Rosa de Cabal, Risaralda Department) is a Colombian former professional road cyclist.
[2] Mejía took up cycling at the age of 16, after watching Lucho Herrera, Fabio Parra and Óscar Vargas racing in the Vuelta a Colombia.
He won the young rider classification in the 1991 Tour de France and finished fourth at the 1991 UCI Road World Championships in Stuttgart, where he was part of the winning break alongside Gianni Bugno, Steven Rooks and Miguel Indurain.
Mejía joined the Motorola team in 1993: that season he won the Volta a Catalunya and finished fourth in the 1993 Tour de France.
Subsequently he spent two more seasons with Motorola before finishing his road racing career with the Petroleo de Colombia team.