The Bayonne Statute (Spanish: Estatuto de Bayona)—also Bayonne Constitution (Spanish: Constitución de Bayona) or Bayonne Charter (Spanish: Carta de Bayona) and, officially in French, Acte Constitutionnel de l’Espagne—was a constitution or a royal charter (Spanish: carta otorgada) approved in Bayonne, France, 6 July 1808, by Joseph Bonaparte as the intended basis for his rule as king of Spain.
The statute was Bonapartist in overall conception, with some specific concessions made in an attempt to accommodate Spanish culture. Few of its provisions were ever put into effect: Joseph Bonaparte's reign as Joseph I of Spain was a period of continuous conventional and guerrilla war (See Peninsular War).
In 1808, after a period of shaky alliance between the Spanish Antiguo Régimen and the Napoleonic French First Empire, the Mutiny of Aranjuez (17 March 1808) removed the king's minister Manuel de Godoy, Prince of the Peace, and led to the abdication of king Charles IV of Spain (19 March 1808). His son Ferdinand VII briefly held the reins of power, but Napoleon determined to settle the monarchy of Spain on a member of his own family, his older brother Joseph.