Polruan (Cornish: Porthruwan) is a small fishing village in the parish of Lanteglos-by-Fowey in Cornwall, England, United Kingdom. It is bounded on three sides by water: to the north by Pont Creek, to the west by the River Fowey and to the south by the English Channel and neighbours village Bodinnick to the north, connected by a 4-mile walk along the hill tops. Polruan is very steep and well protected from the prevailing winds and Polruan Pool is a haven for small boats.
Polruan also has a blockhouse fortification built in the 14th century that guards the entrance to the river Fowey, one of a pair—its partner being situated on the Fowey side of the river. The Polruan blockhouse is well preserved due to the efforts of various enthusiastic councillors and conservationists on the Polruan side of the river, in contrast to the blockhouse in Fowey. Between the two blockhouses was strung a defensive chain to prevent enemy ships entering the harbour, the chain being lowered for friendly vessels. This was primarily used during the wars with the Dutch