William Riley
William, Bill, Billy, or Willie Riley may refer to:
Sports
- William Riley (Nottinghamshire cricketer)
- William Riley (Leicestershire cricketer)
- Bill Riley (ice hockey, born 1921), American ice hockey player
- Bill Riley (ice hockey, born 1950), Canadian ice hockey player
- Bill Riley Jr., American ice hockey player and coach
- Billy Riley, English professional wrestler, coach, promoter, and referee
- Billy Riley (baseball), outfielder in Major League Baseball
Arts and entertainment
- Willie Riley, British author
- William K. Riley, one of the pen names of British author John Creasey
- Bill Riley Sr., American entertainer
- Billy Lee Riley, American musician
Other
- William Riley (architect), British architect
- William J. Riley, United States federal judge
- William F. Riley (judge), United States federal judge
- William F. Riley (engineer), American engineer and professor
- William Harrison Riley, British socialist
- William Bell Riley, American religious leader
- William Riley (criminal), a.k.a. "Mush" Riley, American saloon keeper and underworld figure
- William E. Riley, American general