| Saint-Dionisy | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Saint-Dionizy (30).svg |
| Arrondissement: | Nîmes |
| Canton: | Saint-Gilles |
| Insee: | 30249 |
| Postal Code: | 30980 |
| Mayor: | Jean-Christophe Gregoire[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Nîmes Métropole |
| Coordinates: | 43.8056°N 4.2294°W |
| Elevation M: | 70 |
| Elevation Min M: | 36 |
| Elevation Max M: | 181 |
| Area Km2: | 3.42 |
Saint-Dionisy (pronounced as /fr/, formerly spelled Saint-Dionizy;[2] oc|Sent Dionisi) is a commune in the Gard department in southern France.