Esprit Requien (6 May 1788, Avignon – 30 May 1851, Bonifacio, Corse-du-Sud) was a French naturalist, who made contributions in the fields of conchology, paleontology and especially botany.
He performed extensive studies of flora native to Corsica and in the environs of Mont Ventoux.
[1] In the fields of conchology and palaeontology, he conducted collecting expeditions to the Pyrenees, Catalonia and Italy.
[2] He is the taxonomic authority of a monotypic plant genus Helxine, now treated as a synonym of Soleirolia soleirolii, in the nettle family Urticaceae.
[3] The genera of lichenized fungi, Requienella (author Jean-Henri Fabre) and the flowering plant Requienia (author Augustin Pyramus de Candolle) are named after him,[4] as are plants with the specific and subspecific epithets of requienii.