John Rex Whinfield
John Rex Whinfield CBE (16 February 1901; Sutton, Surrey, England – 6 July 1966; Dorking, Surrey) was a British chemist who, together with James Tennant Dickson investigated polyesters and in 1941 produced and patented the first polyester fibre which they named Terylene, also known as Dacron, equal to or surpassing nylon in toughness and resilience.
He worked initially as an assistant to Charles Frederick Cross and Edward John Bevan who had done earlier work on viscose rayon in 1892. In 1924 he was employed as a research chemist by the Calico Printers' Association based in Manchester.
During the late 1930s, the hunt was on for new synthetic fibres to rival Wallace H. Carothers' nylon. Whinfield and his assistant James Tennant Dickson investigated other types of polymers with textile fibre potential. Whinfield and Dickson discovered how to condense terephthalic acid and ethylene glycol to yield a new polymer which could be drawn into a fibre. Whinfield and Dickson patented their invention in July 1941, but due to wartime secrecy restrictions it was not made public until 1946. ICI (Terylene) and DuPont (Dacron) went on to produce their own versions of the fibre.
- Commander of the Order of the British Empire (1954) 
- Honorary fellowship of the Textile Institute (1955)
- Perkin Medal of the Society of Dyers and Colourists (1956)