William Willoughby

• Bill Willoughby
• Nottingham (UK Parliament constituency)
• William Arnson Willoughby
• William F. Willoughby
• William Willoughby (c.1566-1615)
• William Willoughby Cole, 1st Earl of Enniskillen
• William Willoughby, 11th Baron Willoughby de Eresby
• William Willoughby, 1st Baron Willoughby of Parham
• William Willoughby, 3rd Baron Willoughby of Parham
• William Willoughby, 5th Baron Willoughby de Eresby
• William Willoughby, 6th Baron Willoughby of Parham