Martletwy is a village, parish and community in the county of Pembrokeshire, Wales.

Martletwy lies in south of the county, the nearest town is Narberth some 7 miles distant to its north and east.

He described the area as good arable and pasture land, which was enclosed, and considerable supplies of coal and culm on the estate of Sir John Owen, which was shipped from a specially-constructed quay at Landshipping on the Eastern Cleddau.

It was operational until the Second World War and in 2017 plans for its development as a heritage attraction were being considered.

A Martletwy electoral ward exists, though this ward stretches beyond the confines of Martletwy community, covering the neighbouring Llawhaden and Uzmaston, Boulston and Slebech.