John William Evans (16 January 1906 – 1990) was a British entomologist who worked as an entomology in Australia and served as director of the Australian Museum from 1954 to 1966.
Evans was born in India and went to Jesus College, Cambridge to study geology, botany and zoology, graduating in 1926.
He then moved to Australia to study sharks and then joined the newly created CSIR (now called the CSIRO).
In 1945 he moved back to London to the Imperial Institute of Entomology and later served in the ministry of agriculture and fisheries.
He obtained specimens from Tasmania which were discovered by his wife and he described them as a new species Hemiodoecus fidelis (after the Latin for "faith").