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- Frances Rafferty – actress
- Max Rafferty – former California State Superintendent of Public Instruction, author and columnist
- Taylor Rain – pornographic actress and nude model
- B-Real – rapper (Cypress Hill)
- Robert Redford – actor (Barefoot in the Park)
- Mason Reese – child actor
- Maria Remenyi – Miss USA 1966
- MC Ren – rapper
- Dane Reynolds – professional surfer (Quiksilver)
- Christina Ricci – actress (The Addams Family)
- Michael Richards – actor (Seinfeld)
- Nicole Richie – actress
- Sally Ride – astronaut (STS-7 and STS-41-G)
- Isiah Rider – basketball player
- Cathy Rigby – gymnast and actress (Peter Pan)
- Jason Ritter – actor (son of John Ritter; grandson of Tex Ritter)
- Tony Robbins – life coach
- Julia Robinson – mathematician
- Dana Rohrabacher – member of the United States House of Representatives
- Jimmy Rollins – baseball player
- Jim Rome – sports radio talk show host
- Kyla Ross - 2012 Olympic Gold Medalist (Artistic Gymnastic)
- Josiah Royce – philosopher
- Marla Ruzicka – activist (Green Party (United States))
Read more about this topic: List Of People From California