George Walton Lucas Jr. was born in Modesto, California the only son among George and Dorothy Lucas's four children. His father sold office supplies and equipment and owned a walnut farm. Lucas was not a good student; he enjoyed racing cars and owned a souped-up, high-powered Fiat (a brand of Italian automobile) in high school.
Shortly before graduating he was involved in a serious car accident, nearly dying from his injuries. After recovering from a three-month hospital stay, Lucas decided that he wanted to go to art school. His parents refused to pay for it, so he instead enrolled at Modesto Junior College to study social sciences.
Lucas became interested in photography and film and began making films with a small camera. While photographing a car race he met Haskell Wexler (1922–), a famous cinematographer (motion picture cameraman), who helped him get into the University of Southern California (USC) film school.
Lucas produced eight student films, including THX-1138: 4EB (1965), in which he explored his vision of the future. After graduating Lucas worked as a cameraman (he filmed part of the famous 1968 Rolling Stones concert in Altamont, California, in which a man was stabbed to death) and as an editor for films produced by the United States Information Agency. While at this job he met Marcia Griffin, a film editor. They married in 1969 and adopted a child in 1981. The couple divorced in 1984, and Lucas later adopted two children on his own.