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- John Ralfs, botanist
- Andy Reed, rugby union player who played for Bath RFC and won 18 caps for Scotland
- Rick Rescorla, a hero of the Twin Towers terrorist attack of September 11th 2001
- Henry Chidley Reynolds, dairy farmer who started the Anchor brand of butter
- Edward Hearle Rodd, ornithologist
- Geoffrey Rowe, Cornish comedian better known as Jethro
- A. L. Rowse, historian, novelist and poet
Read more about this topic: List Of People From Cornwall