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The California oil and gas industry has been a major economic and cultural component of the US state of California for over a century. Oil production was a minor factor in the 19th century, with kerosene replacing whale oil and lubricants becoming essential to the machine age. Oil became a major California industry in the 20th century with the discovery on new fields around Los Angeles and the San Joaquin Valley, and the dramatic increase in demand for gasoline to fuel automobiles and trucks. In 1900 California pumped 4 million barrels (640,000 m³), nearly 5% of the national supply. Then came a series of major discoveries, and the state pumped 100 million bbl (16 million m³) in 1914, or 38% of the national supply. In 2012 California produced 197 million bbl (31 million m³) of crude oil, out of the total 2,375 million bbl (378 million m³) of oil produced in the US, representing 8.3% of national production. California drilling operations and oil production are concentrated primarily in Kern County, San Joaquin Valley and the Los Angeles basin.

Patrick Wayne Kearney, also known as The Trash Bag Killer and The Freeway Killer, is an American serial killer and necrophile who murdered a minimum of twenty-one young men and boys throughout southern California between 1962 and 1977.