Henry Hallam FRS FRSE FSA FRAS (9 July 1777 – 21 January 1859) was an English historian. Educated at Eton and Christ Church, Oxford, he practised as a barrister on the Oxford circuit for some years before turning to history. His major works were View of the State of Europe during the Middle Ages (1818), The Constitutional History of England (1827), and Introduction to the Literature of Europe, in the Fifteenth, Sixteenth and Seventeenth Centuries (1837). Although he took no part in politics himself, he was well acquainted with the band of authors and politicians who led the Whig party. In an 1828 review of Constitutional History, Robert Southey claimed that the work was biased in favour of the Whigs.

Hallam was a fellow of the Royal Society, and a trustee of the British Museum. In 1830 he received the gold medal for history founded by George IV.