William Mahoney

William Mahoney may refer to:


 * William Mahoney (mayor) (1869–1952), Irish-American mayor of St. Paul, Minnesota
 * William Mahoney (footballer) (1885–1939), Australian rules footballer who played for the Geelong Football Club
 * William Austin Mahoney (1871–1952), Canadian architect
 * William B. Mahoney (1912–2004), U.S. journalist and writer who had a successful late-in-life second career as a substance-abuse counselor
 * William F. Mahoney (1856–1904), U.S. Representative from Illinois
 * Bill Mahoney (1939–2021), Canadian ice hockey player and coach
 * William P. Mahoney Jr. (1916–2000), United States Ambassador to Ghana