Carew Tidal Mill, also called the French Mill, is a corn mill in Pembrokeshire, Wales, powered by tidal water. It was built around 1801 just west of Carew Castle, and replaced a much older mill in the same location. The mill pond fills through open flood gates as the tide comes in. The gates are closed at high tide, and the pond drains through sluices under the mill as the tide falls, driving two undershot water wheels. It is the only intact mill of this type in Wales.