Fernando de Aragón, 1st Duke of Montalto

Fernando de Aragón y Guardato, 1st Duke of Montalto (before 1494–1542) was the eldest bastard son of king Ferdinand I of Naples and Diana Guardato, one of his mistresses.

The addition "Montalto de Aragón" is in remembrance of his grandfather, Alfonso V of Aragon.

Fernando was the ninth child of Ferdinand I of Naples.

He first married Anna Sanseverino.

He then married, Castellana de Cardona, and had the following: