San Dionisio is the Spanish-language version of Saint Dionysius. It may refer to:
Places El Salvador San Dionisio, Usulután Mexico San Dionisio del Mar, Oaxaca San Dionisio Ocotepec, Oaxaca San Dionisio Ocotlan, Oaxaca Nicaragua San Dionisio, Matagalpa Philippines San Dionisio, Iloilo San Dionisio, Parañaque
United States Redoubt San Dionisio, a fortification in Russian America, near today's Wrangell, Alaska
See also Saint Dionysius