Vito William "Billy Jack" Giacalone (April 16, 1923 – February 19, 2012) was an American organized crime figure in Detroit, serving as a capo in the Detroit Partnership. He was the younger brother of Anthony Giacalone, also a capo in the Detroit crime family.
Vito was born in Detroit, Michigan. He owned bars and a bowling alley amongst other legitimate business holdings over the years. He was a close associate of Salvatore Lucido, Peter Vitale and his brother Anthony. His rap sheet included traffic warrants, loitering, concealed weapons charges and gambling. Vito was a gambling controller for the Detroit Mafia in the area known as the Greek section, succeeding Pete Corrado as the Detroit mob's representative in this area.
Giacalone was described in a 1992 court document as "the most important figure in the Detroit 'Family' after its 'boss' Jack Tocco". Furthermore, a 1992 IRS document cited Giacalone as "one of the prime suspects in the 1975 disappearance of former Teamsters leader Jimmy Hoffa". He died of natural causes in February, 2012.