William Orr
Bill, Billy, Willie or William Orr may refer to:
In activism or public service
- William Orr , member of United Irishmen who was executed
- William Orr , Australian politician and mining prospector
- Sir William Orr-Ewing, 2nd Bt., son of Sir Archibald Orr-Ewing, 1st Baronet
- William Edwin Orr, American federal judge
- William Orr , Australian coal miner and trade unionist
- Bill Orr , American insurance executive and Nebraska's only First Gentleman
In sports
- Willie Orr, Scottish football player and manager
- Willie Orr , footballer for Fulham F.C.
- Billy Orr , Australian rules footballer
- Billy Orr , Major League Baseball infielder
- Bill Orr, American racing driver in 1964 and 1965 Armstrong 500#Results
- Billy Orr , Canadian professional ice hockey defenceman
- Will Orr, New Zealand rally driver in 1992 World Rally Championship#Drivers' championship
- Bill Orr , Scottish Football Coach, Head of Performance Analysis for Stirling Albion Football Club
Other
- William Somerville Orr, English publisher and founder of William S Orr & Co.
- William McFadden Orr, British and Irish mathematician
- William Orr, American architect who built 1928 First Presbyterian Church
- William Orr, Scottish theatre director who immigrated to Australia and founded Phillip Street Theatre in 1953
- William T. Orr, American television producer
- William I. Orr, American amateur radio licensee and author