San Antonio is a town and municipality located in the Mexican state of San Luis Potosí. It is situated within the San Luis Potosí region, which occupies a central area of Mexico.
As a municipality, San Antonio serves as both a populated settlement and an administrative division of San Luis Potosí state. The town functions as the municipal seat for the surrounding rural and semi-rural areas that comprise the municipality. Like many municipalities in San Luis Potosí, it reflects the region's mix of agricultural heritage and traditional Mexican community structures.