Sir John Warcup "Kappa" Cornforth, Jr., AC, CBE, FRS, FAA (7 September 1917 – 14 December 2013) was an Australian-British chemist. He won the Nobel Prize in Chemistry in 1975 for his work on the stereochemistry of enzyme-catalysed reactions.
Cornforth died on 14 December 2013 from natural causes at his Brighton home, aged 96.