San Pedro (trichocereus pachanoi) is a cactus native to the southwestern United States and adjacent areas of Mexico. San Pedro contains mescaline, a hallucinogenic drug also found in various other area cacti.

San Pedro de Atacama is a town in the Atacama desert of northern Chile, bordering the Altiplano (high plain) region and the Bolivian border. It is overlooked by the 19,000-foot volcano Licancabur.