 The 35 ft waterwheel | |
 | |
| Established | 1975 |
|---|---|
| Location | Carthew, Cornwall grid reference SX 005 555 |
| Coordinates | 50°21′55″N 4°48′25″W / 50.3654°N 4.8070°W |
| Type | Open-air museum |
| Website | www |
The Wheal Martyn China Clay Museum is a museum of china clay mining, at Carthew, on the B3274 road about 2 miles (3.2 km) north of St Austell in Cornwall, England. A Victorian clay works has been preserved, and there is an exhibition building.