John Davy Rolleston FSA FRCP (25 February 1873 – 13 March 1946) was an English physician and folklorist, who published extensively on infectious diseases and the history of medicine.

[2] His interest in infectious diseases was reflected in his handbook on Acute Infectious Diseases, published in 1925, where he highlighted the seriousness of otitis media as a complication of scarlet fever and his experience with the ineffectiveness of using vaccines to treat whooping cough.

[5] He was elected a fellow of the Royal College of Physicians in 1931,[4] and was a member of a number of medical bodies including the French Society of Paediatrics.

[2] Like his brother, Humphry, he advocated humanism and was interested in the history and philosophy of medicine,[2] a subject on which he was regarded as an authority.

[1] Rolleston died on 13 March 1946, his career and reputation somewhat overshadowed by the imposing personality of his brother, Humphrey.