William Dunn
William, Willie or Billy Dunn may refer to:
Politics
- Sir William Dunn, 1st Baronet, of Lakenheath, banker and Liberal MP for Paisley
- Sir William Dunn, 1st Baronet, of Clitheroe, British Conservative politician
- William Dunn
- William E. Dunn, mayor of Murray, Utah
- William McKee Dunn, U.S. Representative from Indiana
Sports
- William Dunn , Canadian Olympic bobsledder
- William Dunn , English footballer, played for Manchester United
- William Thomas Dunn, American football player for Penn State
- Willie Dunn , English golfer and golf course designer
- Willie Dunn Sr., Scottish golfer
- Billy Dunn , Scottish footballer with Stoke and other clubs
- Billy Dunn , Scottish footballer with Celtic, Brentford, Southampton
- Billy Dunn , English footballer with Darlington
- Billy Dunn , American dirt modified racing driver
Other
- William Dunn , Scottish agriculturist, mechanic, and mill owner
- William Dunn , American Civil War sailor
- William Dunn , president of Royal College of Physicians, see Lumleian Lectures
- William Arthur Dunn, Methodist clergyman in South Australia
- William Ellsworth Dunn, city attorney of Los Angeles, California
- William N. Dunn, American professor of international relations at the University of Pittsburgh
- William R. Dunn , American film actor and writer
- William R. Dunn , American World War II fighter pilot
- Sir William Dunn Professor of Biochemistry, chair at the University of Cambridge
- Willie Dunn, Canadian singer-songwriter, film director, and politician