Robert Willoughby may refer to: Robert Willoughby, 1st Baron Willoughby de Broke (1452–1502), one of the chief commanders against the Cornish rebels for Henry VII Robert Willoughby, 2nd Baron Willoughby de Broke (1472–1521), English peer Robert Willoughby, 6th Baron Willoughby de Eresby (c.1385 – 1452), English baron and soldier in the Hundred Years' War Robert Hugh Willoughby (1921–2018), American flute player and teacher Robert William Douglas Willoughby, administrator in British India