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 Gretchen Mol Gillian Actor Ben Rosenfield Willie Thompson Actor Jeffrey Wright Dr. Valentin Narcisse Actor Patricia Arquette Sally Wheet Guest Star Ian Hart Ethan Thompson Guest Star Boris McGiver Sheriff Jacob Lindsay Guest Star Domenick Lombardozzi Ralph Capone Guest Star Matt Letscher Joseph Kennedy Guest Star Louis Cancelmi Mike D'Angelo Guest Star Terence Winter Executive Producer Martin Scorsese Executive Producer Timothy Van Patten Executive Producer Stephen Levinson Executive Producer Mark Wahlberg Executive Producer