| Aulnay-l'Aître | |
| Commune Status: | Commune |
| Arrondissement: | Vitry-le-François |
| Canton: | Vitry-le-François-Champagne et Der |
| Insee: | 51022 |
| Postal Code: | 51240 |
| Mayor: | Michel Lonclas[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Vitry Champagne Der |
| Coordinates: | 48.8233°N 4.5608°W |
| Elevation M: | 156 |
| Area Km2: | 8.36 |
Aulnay-l'Aître (in French pronounced as /o(l)nɛ lɛtʁ/) is a commune in the Marne department in northeastern France.