Petrochemicals are chemical products derived from petroleum. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as corn or sugar cane.

This article focuses on organic compounds that are not burned as fuel (see also Petroleum product).

Two petrochemical classes are olefins including ethylene and propylene, and aromatics including benzene, toluene, and xylene isomers. Oil refineries produce olefins and aromatics by fluid catalytic cracking of petroleum fractions. Chemical plants produce olefins by steam cracking of natural gas liquids like ethane and propane. Aromatics are produced by catalytic reforming of naphtha. Olefins and aromatics are the building-blocks for a wide range of materials such as solvents, detergents, and adhesives. Olefins are the basis for polymers and oligomers used in plastics, resins, fibers, elastomers, lubricants, and gels.

Global ethylene and propylene production are ~115 million tonnes and ~70 million tonnes per annum, respectively. Aromatics production is ~70 million tonnes. The largest petrochemical industries are located in the USA and Western Europe; however, major growth in new production capacity is in the Middle East and Asia. There is substantial inter-regional petrochemical trade.

Dorothy Ann Willis Richards (September 1, 1933 – September 13, 2006) was an American politician from Texas. She first came to national attention as the state treasurer of Texas, when she delivered the keynote address at the 1988 Democratic National Convention. Richards served as the 45th Governor of Texas from 1991 to 1995 and was defeated for re-election in 1994 by George W. Bush. Ann Richards was the second female governor of Texas, and the 39th Democratic governor to serve.

Dorothy Ann Willis was born in Lakeview (now part of Lacy-Lakeview), McLennan County, the only child of Robert Cecil Willis and Mildred Iona Warren. She grew up in Waco, participated in Girls State, and graduated from Waco High School in 1950. She attended Baylor University on a debate scholarship and earned a bachelor's degree. After marrying high school sweetheart David "Dave" Richards, she moved to Austin, where she earned a teaching certificate from the University of Texas. David and Ann Richards had four children named Cecile, Daniel, Clark, and Ellen.