Bill Gannon
Bill or William Gannon may refer to:
- William F. Gannon, American Catholic priest and Jesuit
- Bill Gannon (baseball), American baseball player
- Bill Gannon (Gaelic footballer), Irish Gaelic footballer
- Bill Gannon (Irish republican), member of the Irish Republican Army
- A fictional character on the American television series Dragnet, played by Harry Morgan
- William J. Gannon, American politician in the state of Iowa
- Bill Gannon (New [Hampshire politician)], New Hampshire politician