James Petiver (c. 1665 – c. 2 April 1718) was a London apothecary, a fellow of the Royal Society as well as London's informal Temple Coffee House Botany Club, famous for his specimen collections in which he traded and study of botany and entomology. He corresponded with John Ray and some of his notes and specimens were used by Carolus Linnaeus in descriptions of new species. The genus Petiveria was named in his honour by Charles Plumier. His collections were bought by Sir Hans Sloane and became a part of the natural history museum.
Born in Hillmorton, Warwickshire where his father was a haberdasher, he studied at Rugby Free School, sponsored by his maternal grandfather. Petiver later stated that "I have often bewailed my not being allowed after that time academical learning." He became an apprentice to an apothecary Charles Feltham in London on 5 June 1677, and was made a freeman of the Society of Apothecaries on 6 October 1685, later supplying medicine to St. Bartholomew's Hospital. In 1692 he set up his apothecary practice at Aldersgate and lived in London for the rest of his life. His office became a centre for visiting travellers and collectors. He managed numerous specimens received by post and was routinely sending collection instructions to his correspondents (he had nearly 80 in America). One visitor, Zacharias von Uffenbach, noted that his specimens were poorly documented and heaped into a cabinet unworthy of display. In 1700 he was appointed as Apothecary to the Charterhouse. Petiver himself did not travel much with visits restricted to Bristol and Cambridge and in 1711 to the Netherlands. He was known for his administrative ability which he extended to the Royal Society to which he was elected in 1695 and Society of Apothecaries. He never married and was found dead around 2 April 1718 (incorrectly noted as 20 April in some sources) after a long illness. His body was taken on 10 April, the pallbearers included Sir Hans Sloane, Dr Levit and four other physicians and was buried at St Botolph Church on Aldersgate.
Petiver visited the Netherlands in 1711 on behalf of Sloane to study the collections of the Dutch entomologist Paul Hermann. He also met Boerhaave and other Dutch naturalists of the period and received an honorary degree from the University of Leiden. He recorded many English folk-names for butterflies, also coining some himself, and wrote some of the first butterfly books that used English names in addition to Latin. He himself was not very proficient in Latin although he was a member of several scholarly societies and an educated gentleman. He named the white admiral butterfly, and gave the name fritillary to another group of butterflies after the Latin word for a chequered dice box. He called skippers "hogs", swallowtails "Royal Williams", walls as "Enfield Eyes" and marbled whites as "Half-Mourners".
Petiver received many specimens, seeds and much other material from correspondents in the overseas, including Samuel Browne and Edward Bulkley in Madras, Jesrel Jones in Barbary, and the Czech Jesuit Georg Joseph Kamel in Manila. Petiver traded these specimens, often at exorbitant prices. From 1709 he used his position in the Society of Apothecaries to use the Chelsea botanic garden for his personal gain. After his death, his collections were purchased by Sir Hans Sloane for £4000, and some of it is now in the Natural History Museum in London. Sloane found the condition of Petiver's collections appalling on purchase in 1718. 
- Gazophylacium naturae et artis (1702–6) — an illustrated catalogue of British insects
- Papilionum Brittaniae Icones (1717) — included 80 British butterflies with life-histories based on rearing
- 1698 An account of some Indian plants etc. with their names, descriptions and vertues; communicated in a letter from Mr James Petiver...to Mr Samuel Brown, surgeon at Fort St George, Philosophical Transactions of the Royal Society, London.
- 1700–1703 — An account of part of a collection of curious plants and drugs, lately given to the Royal Society of the East India Company, Philosophical Transactions of the Royal Society
- Guildhall Library, London MS 8200/2.
- Edwards, Phyllis I. (1981-04-01). "Sir Hans Sloane and his curious friends". Archives of Natural History. 1981 (1): 27–35. doi:10.3366/anh.1981.006. ISSN 0260-9541.
- Allen, D. E. (2004). "Petiver, James (c.1665–1718)". Oxford Dictionary of National Biography. Oxford University Press. doi:10.1093/ref:odnb/22041. (Subscription required (. ))
- Rees, Abraham (1819). The Cyclopaedia. Volume 27.
- Michael A. Salmon; Peter Marren; Basil Harley (2000). The Aurelian legacy: British butterflies and their collectors. University of California Press. pp. 103–105.
- Kroupa, Sebestian (Nov 2015). "Ex epistulis Philippinensibus: Georg Joseph Kamel SJ (1661–1706) and His Correspondence Network". Centaurus. 57 (4): 229–59. doi:10.1111/1600-0498.12099. ISSN 1600-0498.
- Stephen, Leslie, ed. (1886). "Brown, Samuel (fl.1700)". Dictionary of National Biography. 7. London: Smith, Elder & Co.
- IPNI. Petiver.
- Aquatilium Animalium Amboinæ, Gazophylacium naturae et artis (partial) and Pteri-Graphia Americana Scans at GDZ Göttingen.
- Gaedike, R.; Groll, E. K. & Taeger, A. 2012: Bibliography of the entomological literature from the beginning until 1863 : online database - version 1.0 - Senckenberg Deutsches Entomologisches Institut. Bibliography
- Petiver, James (1715). "The South-Sea Herbal". The Biodiversity Heritage Library