Sir John Robert Seeley (10 September 1834 – 13 January 1895) was an English essayist and historian.
He was born in London, the son of R. B. Seeley, a publisher and author of several religious books and of The Life and Times of Edward I. Seeley developed a taste for religious and historical subjects. He was educated at the City of London School and at Christ's College, Cambridge, where he was head of the classical tripos and senior chancellor's medallist, was elected fellow and became classical tutor of his college. For a time he was a master at his old school, and in 1863 was appointed professor of Latin at University College, London. He was made Regius Professor of Modern History, Cambridge in 1869.
In August 1869, he married Mary Agnes Phillot, who survived him. He is buried in the Mill Road cemetery, Cambridge, with his wife.