The Barony of Willoughby de Eresby (pronounced "Willuhby Deersby") is a barony by writ in the Peerage of England, dating to 1313. Higher titles which have at times been held by Barons Willoughby de Eresby include Earl of Lindsey, Marquess of Lindsey, Duke of Ancaster and Kesteven, and Earl of Ancaster. Since 1626, it has been associated with office of Lord Great Chamberlain. In that year, the first Earl of Lindsey inherited the Great Chamberlainship. It eventually passed to the fourth Duke of Ancaster and Kesteven, upon the death of whom it was divided between his daughters Priscilla and Georgiana (who was later Marchioness of Cholmondeley). The barony, which had fallen into abeyance, was granted to Priscilla. Thereafter, the barony of Willoughby de Eresby has been associated with the senior share of the Lord Great Chamberlainship. However, it has not been associated with the highest share. The share belonging to Lady Cholmondeley has been passed intact to her heirs, the Marquesses of Cholmondeley, but Lady Willoughby de Eresby's share has been split between many heirs. As of 2004, only one-fourth of the Lord Great Chamberlainship is possessed by the holder of the barony.

Barons Willoughby de Eresby (1313)

• Robert de Willoughby, 1st Baron Willoughby de Eresby (1260-1317)
• John de Willoughby, 2nd Baron Willoughby de Eresby (1304-1349)
• John de Willoughby, 3rd Baron Willoughby de Eresby (1329-1372)
• Robert Willoughby, 4th Baron Willoughby de Eresby (1349-1396)
• William Willoughby, 5th Baron Willoughby de Eresby (1370-1409)
• Robert Willoughby, 6th Baron Willoughby de Eresby (1385-1452)
• Joan Willoughby, 7th Baroness Willoughby de Eresby (d. 1462)
• Robert Welles, 8th Baron Willoughby de Eresby, 8th Baron Welles (d. 1470)
• Joan Welles, 9th Baroness Willoughby de Eresby, 9th Baroness Welles (d. 1475)
• Christopher Willoughby, 10th Baron Willoughby de Eresby (1453-1499)
• William Willoughby, 11th Baron Willoughby de Eresby (1482-1526)
• Katherine Willoughby, 12th Baroness Willoughby de Eresby (1519-1580)
• Peregrine Bertie, 13th Baron Willoughby de Eresby (1555-1601)
• Robert Bertie, 1st Earl of Lindsey, 14th Baron Willoughby de Eresby (1582-1642)
• Montagu Bertie, 2nd Earl of Lindsey, 15th Baron Willoughby de Eresby (d.1666)
• Robert Bertie, 3rd Earl of Lindsey, 16th Baron Willoughby de Eresby (1630-1701)
• Robert Bertie, 1st Duke of Ancaster and Kesteven, 17th Baron Willoughby de Eresby (1660-1723)
• Peregrine Bertie, 2nd Duke of Ancaster and Kesteven, 18th Baron Willoughby de Eresby (1686-1742)
• Peregrine Bertie, 3rd Duke of Ancaster and Kesteven, 19th Baron Willoughby de Eresby (1714-1778)
• Robert Bertie, 4th Duke of Ancaster and Kesteven, 20th Baron Willoughby de Eresby (1756-1779) (abeyant 1779)
• Priscilla Bertie, 21st Baroness Willoughby de Eresby (1761-1828) (abeyance terminated 1780)
• Peter Robert Drummond-Willoughby, 22nd Baron Willoughby de Eresby (1782-1865)
• Albyric Drummond-Willoughby, 23rd Baron Willoughby de Eresby (d. 1870) (abeyant 1870)
• Clementina Drummond-Willoughby, 24th Baroness Willoughby de Eresby (1809-1888) (abeyance terminated 1871)
• Gilbert Henry Heathcote-Drummond-Willoughby, 1st Earl of Ancaster, 25th Baron Willoughby de Eresby (1830-1910)
• Gilbert Heathcote-Drummond-Willoughby, 2nd Earl of Ancaster, 26th Baron Willoughby de Eresby (1867-1951)
• Gilbert James Heathcote-Drummond-Willoughby, 3rd Earl of Ancaster, 27th Baron Willoughby de Eresby (1907-1983)
• Nancy Heathcote-Drummond-Willoughby, 28th Baroness Willoughby de Eresby (b. 1934)