Henry (Harry) Jocelyn Seymour, 9th Marquess of Hertford DL (born 6 July 1958) is a British peer, the son of Hugh Seymour, 8th Marquess of Hertford. He was educated at Harrow School and the Royal Agricultural College, Cirencester. He currently resides at Ragley Hall, Warwickshire, where he has been in charge of the estate since 1991.
He is a Deputy Lieutenant of Warwickshire.
In 1990, he married Brazilian-born Beatriz Karam. They have four children: