John Green Crosse, FRCS, FRS (1790–1850) was a well-known English surgeon of his day, at the old Norfolk and Norwich Hospital.
Crosse was born on 6 September 1790, at Boyton Hall, Great Finborough, Suffolk, the second son of William Cross, a farmer, and Ann (née Green).
At an early age he was apprenticed to Thomas Bayly, a surgeon-apothecary in Stowmarket. When his apprenticeship was finished he went to London, and studied at St. George's Hospital and at the Windmill Street School of Medicine. Benjamin Brodie then recommended him to James Macartney as a demonstrator at Trinity College, Dublin. Not receiving a diploma there, Crosse (who had added an 'e' to his surname in line with several of his paternal ancestors) left Dublin and went to Paris, where he spent the winter of 1814–15. In March 1815 he settled in Norwich.
In 1823 Crosse became assistant-surgeon to the Norfolk and Norwich Hospital, and in 1826 surgeon. He became known as a lithotomist, and had a large surgical practice.
In 1836 Crosse was elected a Fellow of the Royal Society. He had a series of 40 apprentices, among them George Murray Humphry. In 1848 his health began to fail. He died on 9 June 1850, and was buried in the cloisters of Norwich Cathedral.
Crosse wrote letters describing hospital practice of Paris to friends in London and Dublin, and on his return published them as a book Sketches of the Medical Schools of Paris. He was mainly interested in anatomy and surgery, and scarcely mentions physicians of Paris; he thought the London education better, except that there were good lectures on medical jurisprudence in Paris, and at that time none in London. In 1820 he published A History of the Variolous Epidemic which occurred in Norwich in the year 1819. It contains an account of the progress of vaccination in the eastern counties.