| Country: | Wales |
| Official Name: | Rhos Cefn Hir |
| Coordinates: | 53.2661°N -4.2165°W |
| Cardiff Distance Mi: | 130.8 |
| Cardiff Distance Km: | 210.5 |
| London Distance Mi: | 210.8 |
| London Distance Km: | 339.2 |
| Community Wales: | Pentraeth |
| Unitary Wales: | Anglesey |
| Constituency Welsh Assembly: | Ynys Môn |
| Constituency Westminster: | Ynys Môn |
| Post Town: | Pentraeth |
| Postcode District: | LL75 |
| Os Grid Reference: | SH 5227 7664 |
Rhos Cefn Hir (or Rhoscefnhir) is a village in the community of Pentraeth, Anglesey, Wales, which is 130.8 miles (210.5 km) from Cardiff and 210.8 miles (339.2 km) from London.[1]