Judson Linsley Gressitt (16 June 1914 - 26 April 1982) was an American entomologist and naturalist who worked in Japan and China. He worked mainly on beetle diversity in Southeast Asia and in applied areas, particularly medical entomology, and was the founder of the journal Pacific Insects (which became the International Journal of Entomology) and the Wau Ecology Institute in Papua New Guinea. Apart from insects, he collected specimens in numerous taxa and several have been named after him.