Lord Henry Thomas Howard-Molyneux-Howard (7 October 1766 – 17 June 1824), known as Henry Howard until 1812 and Henry Molyneux-Howard until 1817, was a British gentleman who served as Deputy Earl Marshal in the latter part of the reign of George III and early in the reign of George IV. On the inheritance of the Dukedom of Norfolk in 1815 by his elder brother Bernard Howard, 12th Duke of Norfolk, Henry Molyneux-Howard in 1817 was granted the courtesy title "Lord", the style of a younger son of a duke.
Howard was the son of Henry Howard (1713–1787) (a descendant of Bernard Howard (1641–1714), a younger son of Henry Howard, 22nd Earl of Arundel (1608-1652) and younger brother of Thomas Howard, 5th Duke of Norfolk (1627-1677) and Henry Howard, 6th Duke of Norfolk (1628-1684)) by his wife Juliana Molyneux, daughter of Sir William Molyneux, 6th Baronet (died 1781), of Teversall, Nottinghamshire, High Sheriff of Nottinghamshire 1737.
On 24 May 1790 Howard was commissioned a captain in the North Battalion, Gloucestershire Militia. He first entered Parliament the same year, being returned for Arundel in Sussex, under the patronage of the Duke of Norfolk of Arundel Castle, and Steyning. His election for Steyning was overturned on petition in 1791, but he represented Arundel until 1795. He was then elected for Gloucester, which seat he held until 1818.