| Petit-Mesnil | |
| Commune Status: | Commune |
| Arrondissement: | Bar-sur-Aube |
| Canton: | Bar-sur-Aube |
| Insee: | 10286 |
| Postal Code: | 10500 |
| Mayor: | Patrick Klein[1] |
| Term: | 2023 - 2026 |
| Coordinates: | 48.3494°N 4.5881°W |
| Elevation M: | 153 |
| Area Km2: | 14.83 |
Petit-Mesnil (pronounced as /fr/) is a commune in the Aube department in north-central France.
Surrounded by the municipalities of La Rothiere, Chaumesnil and Éclance, Petit-Mesnil is located 38 km northeast of Troyes, the largest nearby city.