| Mesterrieux | |
| Commune Status: | Commune |
| Arrondissement: | Langon |
| Canton: | Le Réolais et Les Bastides |
| Insee: | 33283 |
| Postal Code: | 33540 |
| Mayor: | Alain Didier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC rurales de l'Entre-Deux-Mers |
| Coordinates: | 44.6469°N -0.0142°W |
| Elevation M: | 30 |
| Elevation Min M: | 12 |
| Elevation Max M: | 86 |
| Area Km2: | 3.59 |
Mesterrieux (in French pronounced as /mɛstɛʁjø/; Occitan (post 1500);: Mèste Riu) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.