William Chapman Hewitson (9 January 1806, in Newcastle upon Tyne – 28 May 1878, in Oatlands Park, Surrey) was a British naturalist.

[1] A wealthy collector, Hewitson was particularly devoted to Coleoptera (beetles) and Lepidoptera (butterflies and moths) and, also, to birds' nests and eggs.

[1] He became a land-surveyor and was for some time employed under George Stephenson on the London and Birmingham Railway.

Delicate health and the accession to an ample fortune through the death of a relative led him to give up his profession and he afterwards devoted himself to scientific studies.

In 1848 he purchased ten or twelve acres of Oatlands Park, Surrey, and built a house there.