Duke of Montalto (Spanish: Duque de Montalto) was a hereditary title in the Peerage of Spain, accompanied by the dignity of Grandee and granted in 1507 by Ferdinand II to his nephew Fernando de Aragón y Guardato, who was an illegitimate son of Ferdinand I of Naples.

[1] In 1958, Luisa Isabel Álvarez de Toledo, 21st Duchess of Medina Sidonia, daughter of the last Duke, requested the rehabilitation of the Dukedom with the denomination of "Montalto de Aragón", so to differentiate it from the existing Dukedom of Montalto also granted in 1507 by Ferdinand II.

[2] The Francoist Government did not accept this request for unknown reasons, and so the title became extinct.

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