Luis Ibarra Castillo is a former Panamanian boxer who won the World Boxing Association flyweight championship. He was born on 1953-02-23 in Colón, Panama.
Nicknamed "El Naja", Ibarra turned professional in 1975 and won the WBA flyweight title in 1979 when he won a decision over Betulio González. He lost the belt in his first defense when he was knocked out by Tae-Shik Kim in the 2nd round in 1980. He recaptured the WBA flyweight title with a decision win over Santos Benigno Laciar in 1981. He again lost the belt in his first defense to Juan Herrera by TKO. He retired the following year, and had a brief and unsuccessful comeback in 1989 and 1990 in Colombia.