Louis Alphonse de Bourbon, Duke of Anjou (Spanish: Luis Alfonso Gonzalo Víctor Manuel Marco de Borbón y Martínez-Bordiú, French: Louis Alphonse Gonzalve Victor Emmanuel Marc de Bourbon; born 25 April 1974 in Madrid) is a member of the Royal House of Bourbon, and one of the current pretenders to the defunct French throne as Louis XX.

As the senior male heir of Hugh Capet by traditional male-line primogeniture, he is often recognised as the "Head of the House of Bourbon", and by Legitimist royalists as the rightful claimant to the French crown, being the senior agnatic descendant of King Louis XIV of France (ruled 1643–1715) through his grandson King Philip V of Spain.

Louis Alphonse is patrilineally the senior great-grandson of King Alfonso XIII of Spain, but because that descent is through his grandfather's morganatic marriage, the crown of Spain has descended to his second cousin, King Felipe VI of Spain. Through his mother, he is also a great-grandson of Spain's caudillo, General Francisco Franco and through his father, a great-great-great-grandson of Queen Victoria of the United Kingdom.

Louis Alphonse was born in Madrid, the second son of Alfonso de Borbón, Duke of Anjou and Cádiz, and of his wife Doña María del Carmen Martínez-Bordiú y Franco, granddaughter of Francisco Franco. Alfonso was at that time the dauphin (using "Duke of Bourbon" as title of pretence) according to those who supported the claim of his father, Infante Jaime, Duke of Segovia to the French throne. On 20 March 1975, the Infante Jaime ("Henri VI" by Legitimist reckoning) died. Alfonso then asserted his claim to be both Head of the House of Bourbon and Legitimist claimant to the throne of France. As such, he took the title "Duke of Anjou", and on 19 September 1981 gave Louis Alphonse the title Duke of Touraine.

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