William Irwin
William Irwin, Will, Bill, or Billy Irwin may refer to:
Law and politics
- William W. Irvin or Irwin, American politician in Ohio
- William W. Irwin, American politician in Pittsburgh, Pennsylvania
- William Irwin , American politician in California
- William Irwin , Unionist politician in Northern Ireland
- Bill Irwin, American politician in Missouri
Sports
- Bill Irwin , American baseball player
- Billy Irwin , Australian footballer
- Bill Irwin , Canadian skier
- Bill Irwin , Northern Irish footballer
- Bill Irwin , American professional wrestler
- William Irwin , Canadian boxer
Others
- Will Irwin, American journalist
- William Andrew Irwin, Canadian theologian
- William Roy Irwin, Canadian-born World War I flying ace
- William Arthur Irwin, Canadian journalist and diplomat
- William C. K. Irwin, American pianist, conductor, and songwriter
- Bill Irwin , Canadian priest
- Bill Irwin, American actor and clown
- William Irwin , American professor of philosophy