The Castle of Castilnovo is located near the little village of Villafranca (Condado de Castilnovo) in the province of Segovia, Castile and León, in Spain.

It was declared Bien de Interés Cultural (National monument) on 3 June 1931.

Its initial construction was executed by the Arabs in mudejar style, with later additions by the later Christian owners.

The Castle was enlarged by Álvaro de Luna and lived in by Ferdinand and Isabella during their travels through the country.

[1] It was the property of the Catholic Monarchs, and through inheritance to the Velasco family.