Robert Willoughby

• Robert Willoughby, 1st Baron Willoughby de Broke, one of the chief commanders against the Cornish rebels for Henry VII
• Robert Willoughby, 2nd Baron Willoughby de Broke, English peer
• Robert Willoughby, 6th Baron Willoughby de Eresby, English baron and soldier in the Hundred Years' War
• Robert Hugh Willoughby, American flute player and teacher
• Robert William Douglas Willoughby, administrator in British India