J. Edgar

Aaron Lazar

Prosecutor Wilentz

Adam Driver

Walter Lyle

Amanda Schull

Anita Colby

Armie Hammer

Clyde Tolson

Barbara Keegan

Bombing Witness

Belinda Gosbee

Gangster's Moll (uncredited)

Billy Smith

Secret Service Officer

Christian Clemenson

Inspector Schell

Damon Herriman

Bruno Hauptmann

David A. Cooper

Franklin Roosevelt

David Clennon

Senator Friendly

Denis O'Hare

Albert Osborne

Dermot Mulroney

Colonel Schwarzkopf

Ed Westwick

Agent Smith

Elizabeth Karr

Secretary (uncredited)

Emily Alyn Lind

Shirley Temple

Gary Werntz

Attorney General

Geoff Pierson

Mitchell Palmer

Geoff Stults

Raymond Caffrey

Gerald Downey

FBI Agent

Gregory Hoyt

Agent One

Gunner Wright

Dwight Eisenhower

Jack Axelrod

Caminetti

Jack Donner

Edgar's Father

Jamie Noel

Racetrack Gambler (uncredited)

Jeffrey Donovan

Robert Kennedy

Jenny Phagan

Baker's Wife

Jessica Hecht

Emma Goldman

Johnny Cicco

Young Agent

Josh Hamilton

Robert Irwin

Josh Lucas

Charles Lindbergh

Josh Stamberg

Agent Stokes

Judi Dench

Anna Marie Hoover

Kaitlyn Dever

Palmer's Daughter

Kelly Lester

Head Secretary

Ken Howard

Harlan Fiske Stone

Kyle Eastwood

Stork Club Band

Lea Coco

Agent Sisk

Lea Thompson

Lela Rogers

Leonardo DiCaprio

John Edgar Hoover

Leslie Augustine

Lindbergh Nanny (uncredited)

Martin Luther King

Self (archive footage) (uncredited)

Michael O'Neill

Senator McKellar

Miles Fisher

Agent Garrison

Naomi Watts

Helen Gandy

Pat Nixon

Self (archive footage) (uncredited)

Richard Nixon

Self (archive footage) (uncredited)

Robert Fleet

Edgar's Mother's Doctor

Roberta Bassin

Roosevelt's Secretary

Ryan McPartlin

Lawrence Richey

Sadie Calvano

Edgar's Niece

Stephen Root

Arthur Koehler

Steve Monroe

Restaurant Host

Taylor Tunes

Film Premier Attendee (uncredited)

Zach Grenier

John Condon