Colonel Sir Horace Beauchamp Seymour (22 November 1791 - 23 November 1851) was a Peelite Member of Parliament for Lisburn, Antrim, Oxford, Bodmin and Midhurst.
Horace Seymour was the son of Admiral Lord Hugh Seymour (son of Francis Seymour-Conway, 1st Marquess of Hertford) and Lady Anne Horatia Waldegrave. He married, firstly, Elizabeth Malet Palk, daughter of Sir Lawrence Palk, Bt., on 15 May 1818. He married, secondly, Frances Selina Isabella Poyntz, daughter of William Stephen Poyntz and Hon. Elizabeth Mary Browne, in July 1835.
He was invested as a Knight Commander, Hanoverian Order (K.C.H.) and gained the rank of Colonel in the service of the British Army.
By his first wife he had three children;