Sir John Eliot KCIE FRS (25 May 1839 – 18 March 1908) was a mathematician and meteorologist who served as the second meteorological reporter to the Indian government, succeeding Henry Francis Blanford. He served as the director-general of Indian observatories from 1899 until his retirement in 1903. He was noted for reorganizing the Indian meteorological department and for his attempts to improve predictions on the monsoons.