Martin Scorsese Director Leonardo DiCaprio Amsterdam Vallon Actor Daniel Day-Lewis Bill "The Butcher" Cutting Actor Cameron Diaz Jenny Everdeane Actor Liam Neeson "Priest" Vallon Actor Jim Broadbent William "Boss" Tweed Actor John C. Reilly Happy Jack Mulraney Actor Henry Thomas Johnny Sirocco Actor Brendan Gleeson Walter "Monk" McGinn Actor Gary Lewis McGloin Actor Stephen Graham Shang Actor Eddie Marsan Killoran Actor Alec McCowen Reverend Raleigh Actor David Hemmings Mr. Schermerhorn Actor Cara Seymour Hell-Cat Maggie Actor Roger Ashton-Griffiths P.T. Barnum Actor Jay Cocks Screenwriter Kenneth Lonergan Screenwriter Steven Zaillian Screenwriter Alberto Grimaldi Producer Harvey Weinstein Producer Maurizio Grimaldi Executive Producer Michael Hausman Executive Producer Michael Ovitz Executive Producer Bob Weinstein Executive Producer Rick Yorn Executive Producer Michael Ballhaus Cinematographer Thelma Schoonmaker Film Editing Howard Shore Original Music Dante Ferretti Production Design Maria-Teresa Barbasso Art Director Dimitri Capuani Art Director Nazzareno Piana Art Director Alessandro Alberti Art Director Ahoora Khalaj Art Director Francesca Lo Schiavo Set Decoration Sandy Powell Costume Design Ellen Lewis Casting