José de Rozas y Meléndez de la Cueva, 1st Count of Castelblanco (16 December 1665 – July 1722) was a Spanish nobleman and colonial official who became a leading figure in Jacobite politics in Europe.
He became involved in Jacobite politics through the exiled court of James Francis Edward Stuart in France and Italy, which had close links with the Spanish court through agents like Toby Bourke.
On 4 February 1717 he was created Duke of St Andrews and Castelblanco, Marquess of Borland, Earl of Fordan, Viscount of The Bass and Lord Divron in the Jacobite peerage of Scotland.
[3] José de Rozas was responsible for sourcing the money to fund the Jacobite rising of 1719.
His second and third marriages were to Mary and Francesca, both daughters of John Drummond, 1st Earl of Melfort.