Trinidad Zaachila is a town and municipality located in the state of Oaxaca in south-western Mexico. It is situated within the Zaachila District, which lies in the western portion of the Valles Centrales Region.
The municipality serves as a local administrative division within the region. While it occupies a specific area within the Oaxacan landscape, its primary geographical identity is defined by its placement in the Valles Centrales.