J. Robert Oppenheimer

Cillian Murphy

Acting

Kitty Oppenheimer

Emily Blunt

Acting

Leslie Groves

Matt Damon

Acting

Lewis Strauss

Robert Downey Jr.

Acting

Jean Tatlock

Florence Pugh

Acting

Ernest Lawrence

Josh Hartnett

Acting

Boris Pash

Casey Affleck

Acting

David Hill

Rami Malek

Acting

Niels Bohr

Kenneth Branagh

Acting

Edward Teller

Benny Safdie

Directing

Roger Robb

Jason Clarke

Acting

Frank Oppenheimer

Dylan Arnold

Acting

Albert Einstein

Tom Conti

Acting

Patrick Blackett

James D'Arcy

Acting

William Borden

David Dastmalchian

Acting

Kenneth Nichols

Dane DeHaan

Acting

Senate Aide

Alden Ehrenreich

Acting

Gordon Gray

Tony Goldwyn

Acting

Haakon Chevalier

Jefferson Hall

Acting

Isidor Rabi

David Krumholtz

Acting

Vannevar Bush

Matthew Modine

Acting

Counsel

Scott Grimes

Acting

Thomas Morgan

Kurt Koehler

Acting

Ward Evans

John Gowans

Acting

Lloyd Garrison

Macon Blair

Acting

Senator McGee

Harry Groener

Acting

Chairman Magnuson

Gregory Jbara

Acting

Senator Bartlett

Ted King

Acting

Senator Pastore

Tim DeKay

Acting

Senator Scott

Steven Houska

Acting

Dutch Student

Petrie Willink

Acting

Werner Heisenberg

Matthias Schweighöfer

Acting

Luis Alvarez

Alex Wolff

Acting

Rossi Lomanitz

Josh Zuckerman

Acting

Hartland Snyder

Rory Keane

Acting

Robert Serber

Michael Angarano

Acting

Jackie Oppenheimer

Emma Dumont

Acting

Mary Washburn

Sadie Stratton

Acting

Barbara Chevalier

Britt Kyle

Acting

George Eltenton

Guy Burnet

Acting

Richard Tolman

Tom Jenkins

Acting

Ruth Tolman

Louise Lombard

Acting

Joe Volpe

Michael Andrew Baker

Acting

Congressman

Jeff Hephner

Acting

Edward Condon

Olli Haaskivi

Acting

Donald Hornig

David Rysdahl

Acting

Kenneth Bainbridge

Josh Peck

Acting

Richard Feynman

Jack Quaid

Acting

Concerned Scientist

Brett DelBuono

Acting

Hans Bethe

Gustaf Skarsgård

Acting

Kurt Gödel

James Urbaniak

Acting

George Kistiakowsky

Trond Fausa Aurvåg

Acting

Seth Neddermeyer

Devon Bostick

Acting

Enrico Fermi

Danny Deferrari

Acting

Klaus Fuchs

Christopher Denham

Acting

Charlotte Serber

Jessica Erin Martin

Acting

J. Ernest Wilkins

Ronald Auguste

Acting

Leo Szilard

Máté Haumann

Acting

Lilli Hornig

Olivia Thirlby

Acting

Lyall Johnson

Jack Cutmore-Scott

Acting

Philip Morrison

Harrison Gilbertson

Acting

Henry Stimson

James Remar

Acting

George C. Marshall

Will Roberts

Acting

James Byrnes

Pat Skipper

Acting

James Conant

Steve Coulter

Acting

AAF Officer

Jeremy John Wells

Acting

Weatherman

Sean Avery

Acting

Army Captain

Adam Kroeger

Acting

Soldier

Drew Kenney

Acting

AAF Officer 2

Bryce Johnson

Acting

Burn Victim

Flora Nolan

Acting

Laughing Woman

Kerry Westcott

Acting

Kissing Woman

Christina Hogue

Acting

Kissing Man

Clay Bunker

Acting

Weeping Man

Tyler Beardsley

Acting

Consoling Woman

Maria Teresa Zuppetta

Acting

Presidential Aide

Kate French

Acting

Harry Truman

Gary Oldman

Acting

Lyndon Johnson

Hap Lawrence

Acting

Senator's Assistant (uncredited)

Meg Schimelpfenig

Acting