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- Castell Rock (Welsh for "Castle Rock") is a Welsh festival
- Castle Rock Brewery is a United Kingdom microbrewery located in Nottingham, England owned and operated by the Tynemill pub chain
- Castle Rock Entertainment, a film production company founded by Rob Reiner and named after Stephen King's fictional town
- The Castle Rock Foundation, an American foundation which seeks to promote free enterprise, limited government, individual rights, and personal responsibility and leadership
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