G
- Warren G – rapper
- Guy Gabaldon – United States Marine Corps
- Lynx and Lamb Gaede – white nationalist twin singers and musicians
- Richard Gage (architect) – 9/11 Truth movement activist
- Trace Gallagher – journalist
- The Game – rapper
- Jeff Garcia – football player
- Jerry Garcia – musician (Grateful Dead)
- Kyle Gass – musician (Tenacious D)
- Dirk Gates – network entrepreneur (Xirrus)
- Jason Giambi – professional baseball player (New York Yankees)
- Tyrese Gibson – actor
- Brad Gilbert – tennis coach
- Melissa Gilbert – actress (Little House on the Prairie), producer
- Sara Gilbert – actress (Roseanne)
- Lillian Moller Gilbreth – engineer (Cheaper by the Dozen)
- Danny Glover – actor
- Rube Goldberg – cartoonist
- Phillip Gonyea – drummer for Against All Will
- Drew Gooden – professional basketball player (Cleveland Cavaliers)
- Jeff Gordon – NASCAR driver
- Joseph Gordon-Levitt – actor
- Mark-Paul Gosselaar – actor
- John Grabow – Major League Baseball player (Chicago Cubs)
- Gloria Grahame – actress
- Joanie Greggains – radio show host, health and fitness expert
- Beatrice Gray – actress
- Billy Gray – actor, motorcyclist
- Sasha Grey – pornographic actress
- Merv Griffin – talk show host, singer, television producer (Jeopardy! and Wheel of Fortune)
- Florence Griffith-Joyner – track athlete
- Josh Groban – musician
- Marjoe Gortner – evangelical minister
- Vince Guaraldi – musician (A Charlie Brown Christmas)
- Kimberly Guilfoyle – television personality
- Tony Gwynn – Hall of Fame baseball player
- Jake Gyllenhaal – actor
Read more about this topic: List Of People From California