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Leandro José Díaz Duarte (February 20, 1928 – June 22, 2013) was a Colombian vallenato music composer. He is mostly known for his ability to compose very descriptive and narrative vallenato songs despite his blindness. His songs have been recorded by many Colombian musicians including Carlos Vives, Diomedes Diaz, Jorge Oñate, Ivan Villazon, among others.
During the 38th version of the Vallenato Legend Festival, Diaz was proclaimed "King for Life of the Vallenato Legend Festival" along with Rafael Escalona, Emiliano Zuleta Baquero, Calixto Ochoa, Adolfo Pacheco and Tobías Enrique Pumarejo.