Godfrey Matthew Hewitt (10 January 1940 – 18 February 2013) was a British professor and evolutionary geneticist at the University of East Anglia who was very influential in the development of the fields of molecular ecology, phylogeography, speciation and hybridisation.

On his return he took up a position at the newly established University of East Anglia, and he was promoted to Professor in 1988.

He worked in the School of Biological Sciences until his retirement in 2005, and subsequently maintained a very substantial scientific output as Emeritus Professor.

At the time of his death Hewitt had 250 peer reviewed academic publications and these had been cited by approximately ten thousand other articles according to Web of Knowledge.

[7][8] In particular Hewitt was influential in understanding the diversity of European biota in the context of glacial cycles.