Guillermo Posadas (1886–1937) was a Mexican composer.
He composed the Mexican folk song "Noche Feliz" ("Happy Night"), recorded by the Italian tenor Enrico Caruso and sung in Spanish.
The song "Noche Feliz" describes a night with Posadas's wife María, and love with his soul.
Posadas was also a musical arranger and assistant director of an orquesta típica in New York, who worked with Mexican singer Carmen Garcia Cornejo, and composer Miguel Lerdo de Tejada.
This article on a North American composer is a stub.