John Fane, 10th Earl of Westmorland, KG, PC (1 June 1759 – 15 December 1841), styled Lord Burghersh between 1771 and 1774, was a British Tory politician of the late 18th and early 19th centuries, who served in most of the cabinets of the period, primarily as Lord Privy Seal ultimately spending 33 years in office.

In 1789 Westmorland was appointed Joint Postmaster General by William Pitt the Younger[citation needed] and sworn into the Privy Council.

Westmorland was a "fierce" defender of slavery, and in 1799 denounced efforts by British abolitionists to abolish Britain's involvement in the Atlantic slave trade.

Their eldest daughter, Lady Sarah Sophia Fane (1785–1867), having thus been made testamentary heiress of her maternal grandfather, married George Child-Villiers, 5th Earl of Jersey, her husband assuming the additional surname of Child.

[citation needed] By his second wife, he had three sons and two daughters, of whom only the eldest child Lady Georgiana Fane outlived both parents and inherited the Brympton estate.