HomeEntertainmentBoardwalk Empire Season 3: Trailer [Video] HBO Jimmy’s dead, Nucky dropped his rose and ring, Atlantic City is up for grabs. You can’t be a half gangster. #BoardwalkEmpire Season 3 begins September 16th at 9PM on HBO. Set your DVR… Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to email this to a friend (Opens in new window)Click to print (Opens in new window)