Édouard Chatton (French pronunciation: ​[edwaʁ ʃatɔ̃]) (born 1883; died 1947, Banyuls-sur-Mer) was a French biologist who first characterized the distinction between the eukaryotic and prokaryotic systems of cellular organization. Chatton coined the terms in his 1925 paper, Pansporella perplex: Reflections on the Biology and Phylogeny of the Protozoa.Chatton's initial interest was in various human pathogenic protozoa, members of the Apicomplexa and Trypanosomatids.