Xavier, Duke of Parma and Piacenza, known in France before 1974 as Prince Xavier de Bourbon-Parme, known in Spain as Francisco Javier de Borbón-Parma y de Braganza or simply as Don Javier (25 May 1889 – 7 May 1977), was the head of the ducal House of Bourbon-Parma and Carlist pretender to the throne of Spain.
He was the second son of the last reigning Duke of Parma Robert I and his second wife Infanta Maria Antonia of Portugal, although born after his father lost the throne.
Educated with austerity at Stella Matutina, he grew up in France, Italy and Austria, where his father had properties.
During World War I, he joined the Belgian army, fighting with distinction.
With his brother Sixtus he was a go-between in the so-called Sixtus Affair, a failed attempt by his brother-in-law, Emperor Charles I of Austria to negotiate a separate peace with the Allies (1916–1917) through the Bourbon-Parma brothers.
In 1936 Don Alfonso Carlos de Borbón, Duke of Madrid died, ending the male line of pretenders to the Spanish throne descended from the rebel founder of Carlism, Infante Carlos, Count of Molina.
In May 1952, persuaded of the need to be appointed king by the National Council of Traditionalist Communion, he agreed to conclude the sixteen years of his regency by being proclaimed King of Spain in Barcelona under the name Javier I.
Soon thereafter he was expelled from Spain by order of the Francoist government.
At the death of his unmarried nephew Robert of Parma in 1974, Prince Xavier became titular Duke of Parma.
By then he was in frail health, having suffered life-threatening injuries in a 1972 traffic accident.
He transferred all political authority to his eldest son, Prince Carlos Hugo of Bourbon-Parma, and formally abdicated as the Carlist king in his elder son's favor in 1975.