Cillian Murphy
J. Robert Oppenheimer
Acting
Emily Blunt
Kitty Oppenheimer
Acting
Matt Damon
Leslie Groves
Acting
Robert Downey Jr.
Lewis Strauss
Acting
Florence Pugh
Jean Tatlock
Acting
Josh Hartnett
Ernest Lawrence
Acting
Casey Affleck
Boris Pash
Acting
Rami Malek
David Hill
Acting
Kenneth Branagh
Niels Bohr
Acting
Benny Safdie
Edward Teller
Directing
Jason Clarke
Roger Robb
Acting
Dylan Arnold
Frank Oppenheimer
Acting
Tom Conti
Albert Einstein
Acting
James D'Arcy
Patrick Blackett
Acting
David Dastmalchian
William Borden
Acting
Dane DeHaan
Kenneth Nichols
Acting
Alden Ehrenreich
Senate Aide
Acting
Tony Goldwyn
Gordon Gray
Acting
Jefferson Hall
Haakon Chevalier
Acting
David Krumholtz
Isidor Rabi
Acting
Matthew Modine
Vannevar Bush
Acting
Scott Grimes
Counsel
Acting
Kurt Koehler
Thomas Morgan
Acting
John Gowans
Ward Evans
Acting
Macon Blair
Lloyd Garrison
Acting
Harry Groener
Senator McGee
Acting
Gregory Jbara
Chairman Magnuson
Acting
Ted King
Senator Bartlett
Acting
Tim DeKay
Senator Pastore
Acting
Steven Houska
Senator Scott
Acting
Petrie Willink
Dutch Student
Acting
Matthias Schweighöfer
Werner Heisenberg
Acting
Alex Wolff
Luis Alvarez
Acting
Josh Zuckerman
Rossi Lomanitz
Acting
Rory Keane
Hartland Snyder
Acting
Michael Angarano
Robert Serber
Acting
Emma Dumont
Jackie Oppenheimer
Acting
Sadie Stratton
Mary Washburn
Acting
Britt Kyle
Barbara Chevalier
Acting
Guy Burnet
George Eltenton
Acting
Tom Jenkins
Richard Tolman
Acting
Louise Lombard
Ruth Tolman
Acting
Michael Andrew Baker
Joe Volpe
Acting
Jeff Hephner
Congressman
Acting
Olli Haaskivi
Edward Condon
Acting
David Rysdahl
Donald Hornig
Acting
Josh Peck
Kenneth Bainbridge
Acting
Jack Quaid
Richard Feynman
Acting
Brett DelBuono
Concerned Scientist
Acting
Gustaf Skarsgård
Hans Bethe
Acting
James Urbaniak
Kurt Gödel
Acting
Trond Fausa Aurvåg
George Kistiakowsky
Acting
Devon Bostick
Seth Neddermeyer
Acting
Danny Deferrari
Enrico Fermi
Acting
Christopher Denham
Klaus Fuchs
Acting
Jessica Erin Martin
Charlotte Serber
Acting
Ronald Auguste
J. Ernest Wilkins
Acting
Máté Haumann
Leo Szilard
Acting
Olivia Thirlby
Lilli Hornig
Acting
Jack Cutmore-Scott
Lyall Johnson
Acting
Harrison Gilbertson
Philip Morrison
Acting
James Remar
Henry Stimson
Acting
Will Roberts
George C. Marshall
Acting
Pat Skipper
James Byrnes
Acting
Steve Coulter
James Conant
Acting
Jeremy John Wells
AAF Officer
Acting
Sean Avery
Weatherman
Acting
Adam Kroeger
Army Captain
Acting
Drew Kenney
Soldier
Acting
Bryce Johnson
AAF Officer 2
Acting
Flora Nolan
Burn Victim
Acting
Kerry Westcott
Laughing Woman
Acting
Christina Hogue
Kissing Woman
Acting
Clay Bunker
Kissing Man
Acting
Tyler Beardsley
Weeping Man
Acting
Maria Teresa Zuppetta
Consoling Woman
Acting
Kate French
Presidential Aide
Acting
Gary Oldman
Harry Truman
Acting
Hap Lawrence
Lyndon Johnson
Acting
Meg Schimelpfenig
Senator's Assistant (uncredited)
Acting