| Allenay | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Allenay (Somme).svg |
| Arrondissement: | Abbeville |
| Canton: | Friville-Escarbotin |
| Insee: | 80018 |
| Postal Code: | 80130 |
| Mayor: | Nathalie Martel[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Villes Sœurs |
| Coordinates: | 50.0875°N 1.4919°W |
| Elevation M: | 110 |
| Elevation Min M: | 62 |
| Elevation Max M: | 117 |
| Area Km2: | 2.18 |
Allenay (in French pronounced as /alnɛ/) is a commune in the Somme department in Hauts-de-France in northern France.
The commune is situated c. 5 km from the English Channel, on the D19 road and 11 km northeast of Le Tréport on the border of the departments of the Somme and Seine-Maritime.