List of Famous people born in California, United States of America

Roberta Williams is an American video game designer, writer, and a co-founder of Sierra On-Line, who developed her first game while living in Simi Valley, California. She is most famous for her work in the field of graphic adventure games with titles such as Mystery House, the King's Quest series, and Phantasmagoria. She is married to Ken Williams and retired in 1999. Roberta Williams is one of the most influential PC game designers of the 1980s and 1990s, and has been credited with creating the graphic adventure genre.

Jerry Quarry, nicknamed "Irish" or "The Bellflower Bomber", was an American professional boxer. During the peak of his career from 1968 to 1971, Quarry was rated by The Ring magazine as the most popular fighter in the sport. His most famous bouts were against Muhammad Ali. Accumulated damage from lack of attention to defence against larger men at the top level, no head guard sparring, and attempted comebacks in 1977, 1983 and 1992 allied to a certain vulnerability to neurological damage also exhibited by his boxing brothers resulted in Quarry developing an unusually severe case of dementia pugilistica. Unable to perform everyday tasks, dependent on his family, and with the fortune he had earned frittered away, Quarry died at 53 years old.

Herbert Anderson was an American character actor from Oakland, California, probably best remembered for his role as Henry Mitchell, the father, on the CBS television sitcom Dennis the Menace.

Howard McGillin is an American actor. He is known for his role of John Jasper in Drood and for portraying the role The Phantom in Andrew Lloyd Webber's The Phantom of the Opera.

Kyle Loren Kingsbury is a retired American professional mixed martial artist. A professional competitor from 2006-2014, Kingsbury also formerly competed for King of the Cage and was a cast member of Spike TV's The Ultimate Fighter: Team Nogueira vs. Team Mir.

Adrien Costa is an American former cyclist, who rode professionally for UCI Professional Continental team Axeon–Hagens Berman in 2016 and 2017.

Chikezie "KZ" Okpala is an American professional basketball player for the Miami Heat of the National Basketball Association (NBA). He played college basketball for the Stanford Cardinal. He is known for being a defensive specialist.

Scott Harbison Swift is a retired admiral in the United States Navy, serving as the commander of the U.S. Pacific Fleet from May 27th, 2015 to May 17th, 2018. He previously served as the director of Navy Staff in the office of the Chief of Naval Operations.

Geoffrey "Jeff" Madrigali is an American competitive sailor and Olympic medalist. He won a bronze medal in the Soling class at the 1996 Summer Olympics in Atlanta, together with Jim Barton and Kent Massey.

Christina Yvonne Cole is an American actress and singer. She is best known for her role as Katie Miller Douglas on the sitcom My Three Sons (1967–1972). She previously had a recurring role as Sunny Day in the detective series Hawaiian Eye (1963). She was also a member of the Four King Cousins, a subgroup of the King Family Singers. In 1963, she played the minor (uncredited) role of Ruth Stewart in Palm Springs Weekend, a spring break party film set in Palm Springs, California. She also appeared previously in My Three Sons as a friend of Robbie, cast in the role of Joanne, before the Katie role was created circa 1966.