Thomas Osborne, 4th Duke of Leeds, KG, PC, DL, FRS, styled Earl of Danby from birth until 1729 and subsequently Marquess of Carmarthen until 1731, was a British peer, politician and judge.

The Cofferer of the Household was formerly an office in the English and British Royal Household. Next in rank to the Comptroller, the holder paid the wages of some of the servants above and below stairs, was a member of the Board of Green Cloth, and sat with the Lord Steward in the Court of the Verge. The cofferer was usually of political rank and always a member of the Privy Council.