William Mahoney

• William Mahoney , Irish-American mayor of St. Paul, Minnesota
• William Mahoney , Australian rules footballer who played for the Geelong Football Club
• William Austin Mahoney, Canadian architect
• William B. Mahoney, U.S. journalist and writer who had a successful late-in-life second career as a substance-abuse counselor
• William F. Mahoney, U.S. Representative from Illinois
• Bill Mahoney, Canadian ice hockey player and coach
• William P. Mahoney Jr., United States Ambassador to Ghana