Bill Gannon

Bill or William Gannon may refer to:
 * William F. Gannon (1859–1916), American Catholic priest and Jesuit
 * Bill Gannon (baseball) (1873–1927), American baseball player
 * Bill Gannon (Gaelic footballer) (1901–1967), Irish Gaelic footballer
 * Bill Gannon (Irish republican) (1902–1965), member of the Irish Republican Army
 * A fictional character on the American television series Dragnet, played by Harry Morgan
 * William J. Gannon (born 1937), American politician in the state of Iowa
 * Bill Gannon (New Hampshire politician) (born 1962), New Hampshire politician