Francisco Javier Castaños, 1st Duke of Bailén


 * For the Mexican town, see Castaños.

Francisco Javier Castaños Aragorri Urioste y Olavide, Count of Castaños y Aragones,  1st Duke of Baylen (es: Don Francisco Javier Castaños Aragorri Urioste y Olavide, Conde de Castaños y Aragones, primer Duque de Bailén.; 22 April 1758 – 24 September 1852), was a Spanish general during the Peninsular War.

Biography
Castaños was born at Madrid.

Castaños is remembered for his victory over the French under Dupont, whom he surrounded and compelled to surrender at the decisive Battle of Bailen in 1808; after this he served under Wellington in several engagements, and was commander of the Spanish army, ready, if required, to invade France in 1815. Recent evidence suggests Castaños may have played a crucial role in the Allied army's success at the Battle of Albuera.

Castaños died at Madrid in 1852.