Sinfelt (February 18, 1931 in Munson, Clearfield County, Pennsylvania – May 28, 2011 in Morristown, New Jersey) was an American chemical engineer whose research on catalytic reforming was responsible for the introduction of unleaded gasoline.
Sinfelt worked for the Standard Oil Development Company (now Exxon Mobil Research and Engineering), where he specialized in developing techniques to speed up chemical reactions.