The Eddystone or Eddystone Rocks are a seaswept and eroded group of rocks ranging 9 mi southwest of Rame Head in Cornwall, England, United Kingdom. Although the nearest point on the mainland to the Eddystone is in Cornwall, the rocks fall within the city limits of Plymouth, and hence within the county of Devon.

For centuries the rocks have been a hazard for the ships in the approaches to the English Channel