Steve Buscemi Enoch "Nucky" Thompson Actor Kelly Macdonald Margaret Schroeder Actor Michael Shannon Nelson Van Alden Actor Shea Whigham Elias Thompson Actor Stephen Graham Al Capone Actor Vincent Piazza Lucky Luciano Actor Paul Sparks Mickey Doyle Actor Michael Kenneth Williams Chalky White Actor Ben Rosenfield Willie Thompson Actor Gretchen Mol Gillian Actor Jeffrey Wright Dr. Valentin Narcisse Actor Anatol Yusef Meyer Lansky Guest Star Ian Hart Young Ethan Thompson Guest Star Chris Caldovino Tonino Sandrelli Guest Star Domenick Lombardozzi Ralph Capone Guest Star Matt Letscher Joseph Kennedy Guest Star Louis Cancelmi Mike D'Angelo Guest Star Jim True-Frost Eliot Ness Guest Star Giampiero Judica Salvatore Maranzano Guest Star Terence Winter Executive Producer Martin Scorsese Executive Producer Timothy Van Patten Executive Producer Stephen Levinson Executive Producer Mark Wahlberg Executive Producer