| Gaillan-en-Médoc | |
| Commune Status: | Commune |
| Arrondissement: | Lesparre-Médoc |
| Canton: | Le Nord-Médoc |
| Insee: | 33177 |
| Postal Code: | 33340 |
| Mayor: | Bertrand Texeraud[1] |
| Term: | 2021 - 2026 |
| Coordinates: | 45.3258°N -0.9533°W |
| Elevation M: | 13 |
| Elevation Min M: | 7 |
| Elevation Max M: | 20 |
| Area Km2: | 42.02 |
Gaillan-en-Médoc (in French pronounced as /ɡajɑ̃ ɑ̃ medɔk/, literally Gaillan in Médoc; Occitan (post 1500);: Galhan de Medòc) is a commune in the Gironde department in southwestern France.