Roger Ward Crosskey (29 January 1930 - 4 September 2017) was a British entomologist who worked at the Commonwealth Institute of Entomology and at the Natural History Museum in London specializing in blackflies (Simuliidae), Tachinidae and the hymenopteran superfamily Evanioidea.
His mother died of cancer when he was sixteen and after that spent a lot of his time outdoors collecting insects including butterflies and diving beetles.
Crosskey joined as an entomologist in the service of the Government of Northern Nigeria to study sleeping sickness in 1951.
They found nearly 20% of the flies being infected in the rainy season and formulated a DDT spraying scheme to reduce the transmission of the parasite.
[2] The tachinid genera Crosskeya and Crosskeyellum are named in his honour as are nearly a dozen species of flies with the epithet crosskeyi.