John Obadiah Westwood (22 December 1805 – 2 January 1893) was an English entomologist and archaeologist also noted for his artistic talents.
Born in Sheffield, he studied to be a lawyer but abandoned that for his scientific interests.
He became a curator and later professor at Oxford University, having been nominated by this friend and patron the Reverend Frederick William Hope, whose donation was the basis of the Hope Collection at Oxford. He was also a Fellow of Magdalen College, Oxford.
Westwood was a Fellow of the Linnean Society and president of the Entomological Society of London (1852–1853).
Among the prominent writers and naturalists he associated with was James Rennie, whom he assisted in the editing of Gilbert White's The Natural History and Antiquities of Selborne in 1833.
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1821 John Fleming Insecta ... publishes Analeceta Entomologica Stockholm 1824 John Curtis with Alexander Henry Haliday and Francis Walker British Entomology, being illustrations and descriptions ... espèces exotiques les plus remarquables (Roret,Paris) 1829 Jean Baptiste Boisduval and John Eatton Le Conte published first installment of Histoire général et iconographie des lepidoptérès et des chenilles ...