Leonardo DiCaprio

Character: John Edgar Hoover

Armie Hammer

Character: Clyde Tolson

Naomi Watts

Character: Helen Gandy

Josh Lucas

Character: Charles Lindbergh

Josh Hamilton

Character: Robert Irwin

Judi Dench

Character: Anna Marie Hoover

Geoff Pierson

Character: Mitchell Palmer

Gunner Wright

Character: Dwight Eisenhower

Dermot Mulroney

Character: Colonel Schwarzkopf

Kaitlyn Dever

Character: Palmer's Daughter

Adam Driver

Character: Walter Lyle

Ed Westwick

Character: Agent Smith

Jessica Hecht

Character: Emma Goldman

Denis O'Hare

Character: Albert Osborne

Lea Thompson

Character: Lela Rogers

Damon Herriman

Character: Bruno Hauptmann

Sadie Calvano

Character: Edgar's Niece

Amanda Schull

Character: Anita Colby

Roberta Bassin

Character: Roosevelt's Secretary

Emily Alyn Lind

Character: Shirley Temple

Barbara Keegan

Character: Bombing Witness

Gerald Downey

Character: FBI Agent

Jeffrey Donovan

Character: Robert Kennedy

Geoff Stults

Character: Raymond Caffrey

Thomas Langston

Character: Young Boy

Lea Coco

Character: Agent Sisk

Aaron Lazar

Character: Prosecutor Wilentz

Cheryl Lawson

Character: Palmer's Wife

Brady Matthews

Character: Inspector

David A. Cooper

Character: Franklin Roosevelt

Kelly Lester

Character: Head Secretary

Jack Donner

Character: Edgar's Father

Dylan Burns

Character: Hoover as a Child

Jack Axelrod

Character: Caminetti

Michael James Faradie

Character: Bureau Agent (1919)

Josh Stamberg

Character: Agent Stokes

Christian Clemenson

Character: Inspector Schell

Billy Smith

Character: Secret Service Officer

Ken Howard

Character: Harlan Fiske Stone

Zach Grenier

Character: John Condon

Johnny Cicco

Character: Young Agent

Steve Monroe

Character: Restaurant Host

Stephen Root

Character: Arthur Koehler

Gary Werntz

Character: Attorney General

David Clennon

Character: Senator Friendly

Michael O'Neill

Character: Senator McKellar

Eric Larkin

Character: Fred Hunter

Eric Frentzel

Character: William Mahan

Kyle Eastwood

Character: Stork Club Band

Gregory Hoyt

Character: Agent One

Jenny Phagan

Character: Baker's Wife

Chris Caputo

Character: Bronx Baker

Shannon McClain Robertson

Character: African American Woman (as Shannon McClain)

Leslie Augustine

Character: Lindbergh Nanny (uncredited)

Jennipher Foster

Character: Lucille Ball (uncredited)

Belinda Gosbee

Character: Gangster's Moll (uncredited)

Elizabeth Karr

Character: Secretary (uncredited)

Martin Luther King Jr.

Character: Self (archive footage) (uncredited)

Lindsay Lucas-Bartlett

Character: Hollywood Starlet (uncredited)

Pat Nixon

Character: Self (archive footage) (uncredited)

Richard Nixon

Character: Self (archive footage) (uncredited)

Jamie Noel

Character: Racetrack Gambler (uncredited)

Miles Fisher

Character: Agent Garrison

Robert Fleet

Character: Edgar's Mother's Doctor

Emily Banks

Character: Radical Citizen (uncredited)

Scot Carlisle

Character: Agent Williams

Ryan McPartlin

Character: Lawrence Richey

Taylor Tunes

Character: Film Premier Attendee (uncredited)