Duke of Berwick

Lower: arms of the Dukedom of Berwick in the peerage of Spain (1707–present)* 1707 (confirmed Spanish title) Philip V Peerage of Spain Carlos Fitz-James Stuart y Martínez de Irujo (Spanish title) Fernando Fitz-James Stuart, 17th Duke of Huéscar (Spanish title) the 10th Duke's heirs, both male or female (Spanish title)

Duke of Berwick () () is a title that was created in the Peerage of England on 19 March 1687 for James FitzJames, the illegitimate son of James II and VII, King of England, Scotland, and Ireland and Arabella Churchill. The title's name refers to the town of Berwick-upon-Tweed in England, near the border with Scotland.

Its creation is not considered part of the illegitimate Jacobite peerage, and no Writ of attainder was issued by Parliament for the Dukedom (although it was for the Duke himself), the title is still considered by some as theoretically extant, albeit dormant, in the Peerage of England and could be petitioned for reinstatement by the legitimate heirs male of the body (as detailed below in the list of Jacobite succession).

Since 13 December 1707, when Philip V, King of Spain confirmed the title in his country, and conferred the dignity of Grandee to the 1st Duke of Berwick, the dukedom is also a title of Spanish nobility. However, unlike the English peerage, the Spanish title follows the rule of absolute primogeniture, which allows a female to succeed if she is the first-born child. Thus following the death of the 10th Duke of Berwick in September 1953, who had only a daughter, the succession has divided into two separate lines.

At this point, the English title was inherited by the nephew of the 10th Duke, Don Fernando Fitz-James Stuart y Saavedra, 19th Duke of Peñaranda (1922–1971), and subsequently Fernando's son Don Jacobo Fitz-James Stuart y Gómez, 20th Duke of Peñaranda (born 1947), who became the 12th Duke of Berwick in 1971. The heir presumptive to the Dukedom is the 12th Duke’s younger brother Don Luis Fitz-James Stuart y Gómez, 14th Marquess of Valderrábano (born 1950). Under the English rule of male primogeniture, since Jacobo and his brother Luis do not have male issue, it is expected that the English peerage title will become extinct.

In contrast, in 1953, the Spanish title was inherited by the 10th Duke’s only daughter, Doña Cayetana Fitz-James Stuart, 18th Duchess of Alba (1926-2014), who was, in her own right, the 11th Duchess of Berwick. When she died in 2014, her son Don Carlos Fitz-James Stuart, 19th Duke of Alba (born 1948) succeeded to the title. The heir apparent to the dukedom is his eldest son Don Fernando Fitz-James Stuart, 17th Duke of Huéscar (born 1990).