Pentewan (Cornish: Bentewyn, meaning foot of the radiant stream) is a coastal village and former port in south Cornwall, England, United Kingdom. It is situated at grid reference SX 019 472 3 miles (4.8 km) south of St Austell at the mouth of the St Austell River. Pentewan is in the civil parish of Pentewan Valley and the ecclesiastical parish of St Austell. Pentewan lies within the Cornwall Area of Outstanding Natural Beauty (AONB).