| Saint-Jean-d'Illac | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Jean-d'Illac (Gironde).svg |
| Arrondissement: | Bordeaux |
| Canton: | Mérignac-2 |
| Insee: | 33422 |
| Postal Code: | 33127 |
| Mayor: | Edouard Quintano[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 44.8106°N -0.7825°W |
| Elevation M: | 46 |
| Elevation Min M: | 34 |
| Elevation Max M: | 61 |
| Area Km2: | 120.57 |
Saint-Jean-d'Illac (in French pronounced as /sɛ̃ ʒɑ̃ dijak/; Occitan (post 1500);: Sent Joan d'Ilhac) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.