| Conflict: | Battle of Alcoraz |
| Partof: | Battles of the Reconquista |
| Date: | 1096 |
| Place: | Outside Huesca |
| Territory: | Christian conquest of Huesca |
| Result: | Aragonese victory |
| Combatant1: | Kingdom of Aragon |
| Combatant2: | Taifa of Zaragoza Kingdom of Castile |
| Commander1: | Sancho Ramírez Peter I Alfonso the Battler |
| Commander2: | Al-Mustain II Gonzalo Núñez de Lara García Ordóñez |
The Battle of Alcoraz took place between 1094 and 1096 outside Huesca, pitting the besieging forces of Peter I of Aragon and Navarre against the allied forces of Al-Musta'in II of the Taifa of Zaragoza and García Ordóñez de Nájera and Gonzalo Núñez de Lara representing Alfonso VI of León and Castille.
The siege had begun some two years earlier, in 1094, with Peter's father, Sancho Ramírez, who was encamped at the time in the Castle of Montearagon intent on retaking the City of Huesca from the Moors. While inspecting the siege efforts around the ramparts of Huesca, Sancho was struck and killed by an arrow. His son continued the siege, finally defeating the allied troops of Al-Musta'in that had come up from Zaragoza on the fields of Alcoraz, just outside of Huesca.
Later legends hold that during the battle, Saint George appeared above the crown of Aragon, to inspire the Christian army who were heavily outnumbered in this first Reconquista. This parallels the legendary story of the Battle of Clavijo, over two hundred years earlier, where Saint James was similarly alleged to have appeared before the Christian forces of the Kingdom of Asturias in the battle against the Saracen armies.
The heraldic war shield known as the Cross of Alcoraz which commemorated the battle was later adopted as the personal coat of arms of King Peter III of Aragon and subsequently incorporated into the flag of the Kingdom of Aragon where it remains to this day.