Llanstinan is a rural parish[1][2] in the community of Scleddau, north Pembrokeshire, Wales, 3 miles (4.8 km) south of Fishguard.

Originally in the ancient Hundred of Dewisland, formerly a pre-Norman cantref, the parish is bordered in the west by the Western Cleddau river and in the east by Nant y Bugail; it is entirely rural.

[1] The 1849 edition expands the population to 170, and notes that there is a small slate quarry in the parish and a Calvinist Methodist place of worship.

[9] The parish church of St Justinian, isolated in farmland, is mediaeval or Norman in origin, but was substantially rebuilt in the 19th century.

[16] The Royal Commission in about 2003 published a paper on the status and history of the house, whose origins are thought to date back to the 16th century, and since then has seen luxurious times to more recent decay.