Lord Henry Seymour (15 December 1746 – 5 February 1830) was a British politician, the second son of Francis Seymour-Conway, 1st Marquess of Hertford. He was known as Hon. Henry Seymour-Conway until 1793, when his father was created a marquess; he then became Lord Henry Seymour-Conway, but dropped the surname of Conway after his father's death in 1794.