William Kennedy may refer to:

• William Kennedy (explorer) (1814-1890), Canadian sailor and part of the search for Sir John Franklin
• William Kennedy (Royal Navy officer) (1838-1916), British admiral
• William Hew Clark-Kennedy (1879-1961), Canadian serviceman and recipient of the Victoria Cross
• William James Kennedy, Acting President of Wolfson College, Oxford
• William Kennedy (author) (born 1928), American Pulitzer Prize-winning author of Ironweed
• William Kennedy Smith (born 1960), American physician and member of the Kennedy political family

Politicians

• William Kennedy (North Carolina) (1768-1834), U.S. Congressman from North Carolina
• William Kennedy (New Jersey) (1775-1826), acting governor of New Jersey
• William Nassau Kennedy (1839-1885), second Mayor of Winnipeg, Manitoba, Canada
• William Kennedy (Connecticut) (1854-1918), United States congressman from Connecticut
• William Costello Kennedy (1868-1923), Canadian businessman and politician
• John William Kennedy (born 1910), Member of the Parliament of Northern Ireland

[ Source: Wikipedia ]