| Country: | Wales |
| Official Name: | Allt-y-Main |
| Coordinates: | 52.7253°N -3.2361°W |
| Cardiff Distance Mi: | 86 |
| Cardiff Distance Km: | 139 |
| London Distance Mi: | 156 |
| London Distance Km: | 252 |
| Unitary Wales: | Powys |
| Community Wales: | Meifod |
| Constituency Welsh Assembly: | Montgomeryshire |
| Constituency Westminster: | Montgomeryshire |
| Post Town: | MEIFOD |
| Postcode District: | SY22 |
| Postcode Area: | SY |
| Os Grid Reference: | SJ 1661 1490 |
Allt-y-Main is a hamlet in the community of Meifod, Powys, Wales, which is 86 miles (139 km) from Cardiff and 156 miles (252 km) from London.[1]