William Quinn
William Quinn may refer to:
- Bill Quinn, American film actor
- Liam Quinn, William Quinn, member of the Provisional IRA
- William Quinn (actor), Canadian film and stage actor
- William F. Quinn, governor of Hawaii
- William J. Quinn, chief of police in San Francisco, California
- William John Quinn, railroad executive
- William P. Quinn, Garda Commissioner
- William Paul Quinn, bishop of the African Methodist Episcopal Church
- William Wilson Quinn, Chevalier Lieutenant General, commanding general of the Seventh United States Army