| Country: | Wales |
| Static Image Name: | Centre of the village, Treffynnon - geograph.org.uk - 3683564.jpg |
| Official Name: | Treffynnon |
| Community Wales: | Brawdy |
| Coordinates: | 51.9167°N -13°W |
| Map Type: | Wales |
| Unitary Wales: | Pembrokeshire |
| Lieutenancy Wales: | Dyfed |
| Constituency Westminster: | Preseli Pembrokeshire |
| Constituency Welsh Assembly: | Preseli Pembrokeshire |
| Post Town: | Haverfordwest |
| Postcode District: | SA62 |
| Postcode Area: | SA |
Treffynnon (Welsh: tref - town + ffynnon - spring, well) is a hamlet of about twenty houses located in the community of Brawdy, between St Davids and Fishguard, about a mile inland from the A487 at Croesgoch in Pembrokeshire.
On the edge of the village stands Treffynnon Chapel, a Welsh Calvinistic Methodist foundation, originally built in 1867 and rebuilt in 1876. Treffynnon has only one named road with the unusual address of Council Houses, a row of six local authority dwellings dating from the 1960s known locally as The Street.