| Country: | Wales |
| Static Image: | Centre of the village, Letterston - geograph.org.uk - 3712159.jpg |
| Static Image Caption: | In the village centre |
| Coordinates: | 51.927°N -4.996°W |
| Official Name: | Letterston |
| Welsh Name: | Treletert |
| Population: | 1245 |
| Population Ref: | (2011)[1] |
| Unitary Wales: | Pembrokeshire |
| Constituency Westminster: | Mid and South Pembrokeshire |
| Constituency Welsh Assembly: | Preseli Pembrokeshire |
| Post Town: | Haverfordwest |
| Postcode District: | SA62 5 |
| Postcode Area: | SA |
| Dial Code: | 01348 |
| Os Grid Reference: | SM940297 |
Letterston (cy|Treletert) is a parish and local government community in north Pembrokeshire, Wales. Situated on the A40, Haverfordwest is to the south and Fishguard is to the north.
The name is derived from the medieval owners of the parish, the Lettard family.[2]
Twelve men of the parish died in World War 1 and six in World War 2; their names are commemorated on the War Memorial at the parish church of St Giles.[3]
An electoral ward in the same name exists. This ward stretches south west to Hayscastle. The total ward population taken at the 2011 Census was 2,352.[4]
Letterston's population was 1,245, according to the 2011 census;[5] a 24.75 per cent increase since the 998 people noted in 2001.[6]
The 2011 census showed 42.1 per cent of the population could speak Welsh, a fall from 47.2 per cent in 2001.[7]