| Country: | Wales |
| Official Name: | Mariandyrys |
| Coordinates: | 53.3088°N -4.0956°W |
| Cardiff Distance Mi: | 132.2 |
| Cardiff Distance Km: | 212.7 |
| London Distance Mi: | 208.5 |
| London Distance Km: | 335.4 |
| Community Wales: | Llangoed |
| Unitary Wales: | Anglesey |
| Constituency Welsh Assembly: | Ynys Môn |
| Constituency Westminster: | Ynys Môn |
| Post Town: | Beaumaris |
| Postcode District: | LL58 |
| Os Grid Reference: | SH 6047 8114 |
Mariandyrys is a village in the community of Llangoed, Anglesey, Wales, which is 132.2 miles (212.7 km) from Cardiff and 208.5 miles (335.4 km) from London.[1]
Within the community and to the west of the village centre is an SSSI which is also a Nature Reserve managed by North Wales Wildlife Trust. It comprises an area of limestone grassland and heath with views to Snowdonia and the coast of Anglesey.[2]