Henry Seymour may refer to:
United Kingdom
- Henry Seymour (16th-century MP) (1503âÂÂ1578), member of parliament (MP) for Hampshire in 1547, brother of Queen Jane Seymour and uncle of Edward VI of England
- Henry Seymour (Langley) (1612âÂÂ1687), friend of Charles II and MP for East Looe
- Henry Seymour (died 1728), English MP
- Henry Seymour (Redland) (1729âÂÂ1807), MP for Totnes, Huntingdon, Evesham, lover of Madame du Barry
- Henry Seymour (Knoyle) (1776âÂÂ1849), MP for Taunton
- Henry Seymour, 9th Marquess of Hertford (born 1958), British peer
- Henry Seymour, Lord Beauchamp (1626âÂÂ1654), English nobleman
- Lord Henry Seymour (naval commander), English admiral who fought the Spanish Armada
- Lord Henry Seymour (politician) (1746âÂÂ1830), MP for Coventry, Midhurst, Downton
- Sir Henry Seymour, 1st Baronet (1674âÂÂ1714), MP for East Looe
- Henry Danby Seymour (1820âÂÂ1877), MP for Poole
- Henry Seymour (Royal Navy officer) (1818âÂÂ1869), naval commander and politician
- Henry Seymour (secularist) (1861âÂÂ1938), secularist, anarchist and gramophone innovator
Other