Clint Eastwood Director, Producer, Original Music Leonardo DiCaprio J. Edgar Hoover Actor Naomi Watts Helen Gandy Actor Armie Hammer Clyde Tolson Actor Josh Lucas Charles Lindbergh Actor Judi Dench Annie Hoover Actor Ken Howard Harlan Fiske Stone Actor Gunner Wright Dwight Eisenhower Actor David A. Cooper Franklin Roosevelt Actor Jeffrey Donovan Robert Kennedy Actor Dermot Mulroney Col. Schwarzkopf Actor Denis O'Hare Albert Osborne Actor Damon Herriman Bruno Hauptmann Actor Stephen Root Arthur Koehler Actor Jessica Hecht Emma Goldman Actor Josh Hamilton Robert Irwin Actor Dustin Lance Black Screenwriter Brian Grazer Producer Robert Lorenz Producer Tim Moore Executive Producer Erica Huggins Executive Producer Tom Stern Cinematographer Joel Cox Film Editing Gary D. Roach Film Editing James J. Murakami Production Design Deborah Hopper Costume Design Fiona Weir Casting Greg Berry Art Director Gary Fettis Set Decoration