Warren is an ancient parish[1][2] in the community of Stackpole and Castlemartin, in the most southerly part of Pembrokeshire, Wales.

Warren was a parish in the hundred of Castlemartin, which in pre-Norman times was part of the Cantref of Penfro in the Kingdom of Dyfed.

[3] The origin of the name is obscure, but there is a Warren Farm (a listed building[4]) and an ancient fortification (a scheduled monument[5]) close by.

[6] Merrion Court is a Grade II listed building in the east of the parish, a 19th-century structure built on 18th century ruins.

[13][14] The former parish church of St Mary is located in a prominent position on a ridge and is thought to date from the 13th century.