| Llanfair-Nant-Gwyn | |
|---|---|
 St Mary's Church | |
  Llanfair-Nant-Gwyn Location within Pembrokeshire | |
| OS grid reference | SN165375 |
| Community |
|
| Principal area | |
| Country | Wales |
| Sovereign state | United Kingdom |
| Post town | Boncath |
| Postcode district | SA37 |
| Dialling code | 01239 |
| Police | Dyfed-Powys |
| Fire | Mid and West Wales |
| Ambulance | Welsh |
| UK Parliament |
|
| Senedd Cymru – Welsh Parliament |
|
Llanfair-Nant-Gwyn is a hamlet and small parish in the community of Eglwyswrw, north Pembrokeshire, Wales. It is a rural parish with few dwellings and was in the ancient Hundred of Cemais.