Diego Fernández (disambiguation)
Diego Fernández (c. 1520–c. 1581) was a Spanish adventurer and historian.
Diego Fernández may also refer to:
- Diego Fernández de Oviedo (fl. 1020–c. 1046), Count of Asturias and father of Jimena Díaz, the wife of Rodrigo Díaz de Vivar, el Cid.
- Diego Fernández de Ovando, Spanish military and nobleman, knight of the Order of Alcántara in 1338.
- Diego Fernández de la Cueva, 1st Viscount of Huelma (died 1473), Spanish nobleman
- Diego Fernández de Córdoba y Arellano, marqués de Comares (1463–1518), Governor of Oran and Mazalquivir, 1509–1512 and 1516–1518, and Viceroy of Navarre, 1512-1515
- Diego Fernández de Proaño, Spanish explorer and conquistador
- Diego Fernández de Cáceres y Ovando (died 1487), Spanish military and nobleman
- Diego Fernández de Córdoba, Marquis of Guadalcázar (1578–1630), Viceroy of Mexico, 1612–1621, and Viceroy of Peru, 1622–1629
- Diego Fernández de Cevallos (born 1941), Mexican politician affiliated to the conservative National Action Party