Vice-Admiral Lord Hugh Seymour was a senior British Royal Navy officer of the late 18th century who was the fifth son of Francis Seymour-Conway, 1st Marquess of Hertford, and became known for being both a prominent society figure and a highly competent naval officer. He served during the American Revolutionary and French Revolutionary Wars and later in his career performed a period of shore duty on the Admiralty board.

Francis Seymour-Conway, 1st Marquess of Hertford, KG, PC, PC (Ire) of Ragley Hall, Arrow, in Warwickshire, was a British courtier and politician who, briefly, was Viceroy of Ireland where he had substantial estates.