| Conflict: | Siege of Astorga (1812) |
| Partof: | the Peninsular War |
| Date: | 29 June – 19 August 1812 |
| Place: | Astorga, Spain |
| Coordinates: | 42.4589°N -6.0633°W |
| Result: | Spanish victory |
| Combatant1: | French Empire |
| Combatant2: | Spain |
| Commander1: | Maximilien Foy |
| Commander2: | |
| Strength1: | 2,000 14–17 guns |
| Strength2: | 28,000 |
| Casualties1: | 1,200 killed, wounded or captured 14–17 guns lost |
| Casualties2: | Unknown |
The siege of Astorga of 1812 took place between 29 June and 19 August 1812, at Astorga, León, Castile-León, Spain, during the Peninsular War.
The French autumn counterattack started with the Siege of Astorga.
On 29 June, the Spanish troops of Lieutenant-General Francisco Gómez de Terán y Negrete, Marquess of Portago, started the operations, and laid siege to Astorga. The siege was part of the Allied offensive in the summer of 1812. The Spanish VI Army led by General José María Santocildes, by order of General Francisco Castaños, take the measures necessary for the recovery of Astorga. On 18 August, after a hard resistance, the French garrison surrendered to the Spaniards. During the siege, part of the Spanish troops marched towards Salamanca to join the Allied army under Arthur Wellesley, commanded by General Santocildes, and contributed successfully in the campaign with the capture of Tordesillas, blocking Toro and Zamora, and occupying Valladolid.
The French autumn counterattack proceeded with the Siege of Burgos.