Fermín Francisco de Carvajal-Vargas, 1st Duke of San Carlos

Fermín Francisco de Carvajal-Vargas y Alarcón, 1st Duke of San Carlos and Grandee of Spain (Chile, 1722 – Madrid, 1799) was a Spanish-Peruvian noble.

He was the last Correo Mayor de Indias, responsible for the postal communication between the Americas and Spain.

He was married at the Cathedral of Lima on 11 June 1741 to his cousin Joaquina María Magdalena Brun y Carvajal.

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