J
- Shirley Jackson – author
- Jesse James – actor, welder, and chief executive officer of West Coast Choppers
- Gregg Jarrett – lawyer, journalist
- Jayden James – pornographic actress
- Richard Jefferson – professional basketball player
- Fran Jeffries – actress (The Pink Panther)
- Steve Jobs – computer pioneer, co-founder of Apple Computer
- Dwayne Johnson (born 1972) – former professional wrestler best known as "The Rock"; now an actor (The Scorpion King)
- Jimmie Johnson – NASCAR driver and champion
- Keyshawn Johnson – professional football player
- Randy Johnson – baseball player (Arizona Diamondbacks)
- Angelina Jolie – actress
- Joe Jonas – guitarist and singer (Jonas Brothers)
- Kevin Jonas – guitarist and back-up singer (Jonas Brothers)
- Nicholas Jonas – guitarist and singer (Jonas Brothers)
- Jerry Jones – owner of the Dallas Cowboys
- Marion Jones – track athlete
- Jessica Jung – singer (Girls' Generation)
- Krystal Jung – singer (F(x))
Read more about this topic: List Of People From California