San Antonio is a village located in the municipality of Agana Heights in Guam. It is situated in the central part of the island, in the Mariana Islands archipelago in the western Pacific Ocean.
Like other settlements in Guam, San Antonio reflects the island's Chamorro cultural heritage and its history as a U.S. territory. The village is part of the broader Agana Heights municipality, which encompasses several communities in the island's interior regions.