San Dionisio is the Spanish-language version of Saint Dionysius. It may refer to:
Places
editEl Salvador
editMexico
edit- San Dionisio del Mar, Oaxaca
- San Dionisio Ocotepec, Oaxaca
- San Dionisio Ocotlan, Oaxaca
Nicaragua
editPhilippines
editUnited States
edit- Redoubt San Dionisio, a fortification in Russian America, near today's Wrangell, Alaska