Calvillo (Spanish: [kalˈβiʝo] ⓘ) is a municipality in the Mexican state of Aguascalientes.

The city of Calvillo, the second largest in the state, serves as the municipal seat.

At the time, they intermixed with the descendants of Spaniards which already inhabited the south part of the valley.

The economy in Calvillo is centered on the guava, although there is other agriculture and a great deal of commerce.

[5] Other than the city of Calvillo, the municipality had 307 localities, the largest of which (with 2010 populations in parentheses) were: Ojocaliente (6,914), classified as urban, and El Cuervero (Cuerveros) (2,350), Valle Huejúcar (Fraccionamiento Popular) (1,991), La Labor (1,988), Malpaso (1,697), San Tadeo (1,507), Chiquihuitero (San Isidro) (1,318), La Panadera (1,212), Mesa Grande (1,149), Jaltiche de Arriba (1,114), and Crucero las Pilas (1,031), classified as rural.