El Siege of Huajuapan de León was a battle of the Mexican War of Independence that was fought from 5 April to 23 July 1812 at Huajuapan de León, in the Mexican state of Oaxaca. The battle was fought between the royalist forces loyal to the Spanish crown, and the Mexican rebels fighting for independence from the Spanish Empire. This Spanish siege of the town, lasting 111 days, was the longest of the entire war. The battle resulted in a victory for the Mexican insurgents.