| Country: | Wales |
| Official Name: | Tyddyn Dai |
| Coordinates: | 53.3978°N -4.3558°W |
| Cardiff Distance Mi: | 141.4 |
| Cardiff Distance Km: | 227.6 |
| London Distance Mi: | 220.7 |
| London Distance Km: | 355.1 |
| Community Wales: | Amlwch |
| Unitary Wales: | Anglesey |
| Constituency Welsh Assembly: | Ynys Môn |
| Constituency Westminster: | Ynys Môn |
| Post Town: | Amlwch |
| Postcode District: | LL68 |
| Os Grid Reference: | SH 4346 9158 |
Tyddyn Dai is a hamlet in the community of Amlwch, Anglesey, Wales, which is 141.4 miles (227.6 km) from Cardiff and 220.7 miles (355.1 km) from London.[1] [2]