James Francis Stephens (16 September 1792 – 22 December 1852) was an English entomologist and naturalist. He is known for his 12 volume Illustrations of British Entomology (1846) and the Manual of British Beetles (1839).
Stephens was born in Shoreham-by-Sea and studied at Christ's Hospital. His father was a navy captain William James Stephens (d. 1799) and his mother was Mary Peck (later Mrs Dallinger). He went to school at the Blue Coat School, Hertford and later at Christ's Hospital, London. He was then sent to study under Shute Barrington (1734–1826), the bishop of Durham in 1800. He left in 1807 and worked as a clerk in the Admiralty office, Somerset House, from 1807 to 1845 thanks to his uncle Admiral Stephens.
Stephens took an interest in natural history even as a schoolboy. He wrote a manuscript Catalogue of British Animals in 1808. He was elected fellow of the Linnean Society on 17 February 1815, and of the Zoological Society of London in 1826. From 1815 to 1825 he took a great interest in ornithology and contributed to the work of George Shaw (1751-1813). He was granted leave from office to assist William Elford Leach in 1818 to arrange the insect collection at the British Museum. He returned to the Admiralty but troubles with his superiors led him to retire early leading to loss of part of his pension. He then worked unpaid in the British Museum until his death and described as many as 2800 British insect species. He often used a pocket lens rather than a microscope and used a killing bottle with crushed laurel leaves rather than pinning specimens directly as was the practice then.
In 1833, he was a founder of what became the Royal Entomological Society of London. Stephens made a large insect collection, which included many type specimens. In 1822 he married Sarah, daughter of a Captain Roberts. Their children died young. Stephens died at Kennington on 22 December 1852 and was survived by his wife. After his death his insect collection was purchased by the British Museum. His library was bought by Henry Tibbats Stainton (1822–1892) who continued to keep Stephen's tradition of keeping the books available to other entomologists on Wednesday evenings. Stainton also published a catalogue of these books Bibliotheca Stephensiana (1853).