The first siege of Gibraltar was a battle of the Spanish Reconquista that took place in 1309. The battle pitted the forces of the Crown of Castile under the command of Juan Núñez II de Lara and Alonso Pérez de Guzmán, against the forces of the Emirate of Granada who were under the command of Sultan Muhammed III and his brother, Abu'l-Juyush Nasr.

Alonso Pérez de Guzmán (1256–1309), known as Guzmán el Bueno, was a Spanish nobleman and hero of Spain during the medieval period, the founder of the line from which the Dukes of Medina Sidonia descend.