Jane Heathcote-Drummond-Willoughby, 28th Baroness Willoughby de Eresby

Nancy Jane Marie Heathcote-Drummond-Willoughby, 28th Baroness Willoughby de Eresby (/ˈwɪləbi ˈdɪərzbi/ WIL-ə-bee DEERZ-bee; born 1 December 1934), is a British aristocratic landowner related to the Astor family and former member of the House of Lords.

Lady Willoughby de Eresby holds a one-quarter interest in the ancient hereditary office of Lord Great Chamberlain, currently held by the 7th Baron Carrington.

Her only brother, Timothy Gilbert Heathcote-Drummond-Willoughby (born 19 March 1936), styled Lord Willoughby de Eresby from 1951 as heir to the Earldom of Ancaster, was lost at sea in 1963.

On his death in 1983, the earldom became extinct, but according to the remainder of ancient baronies by writ of summons, Lady Jane Heathcote-Drummond-Willoughby succeeded as Baroness Willoughby de Eresby.

Lady Willoughby also inherited 75,000 acres (300 km2) divided between Lincolnshire and Perthshire and in 2008 was ranked 1,572nd in a list of richest people forming the annual report of the Sunday Times, citing her wealth as £48 million.