Celaya (seˈlaja; ) is a city and its surrounding municipality in the state of Guanajuato, Mexico, located in the southeast quadrant of the state. It is the third most populous city in the state, with a 2005 census population of 310,413. The municipality for which the city serves as municipal seat, had a population of 415,869. The city is located in the geographic center of the municipality, which has an areal extent of 553.1 km2 (213.6 sq mi) and includes many smaller outlying communities, the largest of which are San Miguel Octopan, Rincón de Tamayo and San Juan de la Vega.
There are many smaller towns around Celaya including Rincón de Tamayo, Tarimoro, Villagrán, La Moncada, Panales Jamaica (Cañones), Panales Galera, La Calera, La Estancia, La Noria, Los Fierros, El Acebuche, Cacalote, and Charco Largo. It is also not far away from Cortazar, Salamanca, Salvatierra, Apaseo el Grande, Querétaro City and among others. The city was founded in 1570 as Villa de la Purisíma Concepción de Zalaya. The word Zalaya is of Basque origin and means "Flat Land".
Celaya was a frontier region between the Purépecha and the Chichimecas.
General Álvaro Obregón defeated Pancho Villa in the Battle of Celaya in 1915, as referred by Martínez Celaya was also the Guanajuato state capital for a short period.
An explosion in a gunpowder and fireworks warehouse in September, 1999, killed over 60 people and injured over 300 people.
On 23 May 2022, eleven people were murdered in a massacre linked to the Mexican drug war.
Celaya has a semi-arid climate (Köppen climate classification BSh).
Centro Pedagogico de Celaya
Colegio Arturo Rosenblueth
Colegio Marista
Colegio Nuevo Continente Bajío Celaya Campus
Complejo Educativo Ignacio Allende
Colegio Mexico
Escuela Bilingue Guilford
Instituto Andersen
Instituto Bilingue Oxford
Instituto Británico de Celaya (BIC)
Instituto Educativo Rosa G.