Letterston (Welsh: Treletert) is a parish and local government community in north Pembrokeshire, Wales.

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.

This ward stretches south west to Hayscastle.

[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.