The Capture of Alhóndiga de Granaditas was a military action carried out in Guanajuato, viceroyalty of New Spain, on September 28, 1810, between the royalist soldiers of the province and the insurgents commanded by Miguel Hidalgo and Ignacio Allende. The fear unleashed in the social circles of the provincial capital made the intendant, Juan Antonio Riaño, ask the population to barrack in the Alhóndiga de Granaditas, a granary built in 1800, and in whose construction Miguel Hidalgo had participated as an advisor to his old friend Riaño. After several hours of combat, Riaño was killed and the Spaniards who had taken refuge there wished to surrender. The military in the viceroy's service continued the fight, until the insurgents managed to enter and then massacred not only the few guards that defended it, but also the numerous families of civilians who had taken refuge there. Many historians consider this confrontation more like a mutiny or massacre of civilians than a battle, since there were no conditions of military equality between the two sides.

Guanajuato, officially the Free and Sovereign State of Guanajuato, is one of the 32 states that make up the Federal Entities of Mexico. It is divided into 46 municipalities and its capital city is Guanajuato.