Aniello John "Mr. Neil" Dellacroce (March 15, 1914 – December 2, 1985), also known as "Father O'Neil" and "The Tall Guy", was an Italian-American gangster and underboss of the Gambino crime family. He rose to the position of underboss when Carlo Gambino moved Joseph Biondo aside. Dellacroce was a mentor to Gambino crime family boss John Gotti.