Matt Damon Leslie Groves
Emily Blunt Kitty Oppenheimer
Robert Downey Jr. Lewis Strauss
Cillian Murphy J. Robert Oppenheimer
Christopher Nolan Director, Producer, Writer
Gary Oldman Harry Truman
Florence Pugh Jean Tatlock
Matthew Modine Vannevar Bush
Rami Malek David Hill
David Dastmalchian William Borden
Gustaf Skarsgård Hans Bethe
Josh Hartnett Ernest Lawrence
Guy Burnet George Eltenton
James Remar Henry Stimson
Jack Quaid Richard Feynman
Kenneth Branagh Niels Bohr
Devon Bostick Seth Neddermeyer
Casey Affleck Boris Pash
Steve Coulter James Conant
James Woods Executive Producer
Alden Ehrenreich Senate Aide
Tony Goldwyn Gordon Gray
Dane DeHaan Kenneth Nichols
Alex Wolff Luis Alvarez
Olivia Thirlby Lilli Hornig
Matthias Schweighöfer Werner Heisenberg
Benny Safdie Edward Teller
Scott Grimes Counsel
James D'Arcy Patrick Blackett
Jason Clarke Roger Robb
Josh Peck Kenneth Bainbridge
Gregory Jbara Chairman Magnuson
David Krumholtz Isidor Rabi
Dylan Arnold Frank Oppenheimer
Tim DeKay Senator Pastore
Tom Conti Albert Einstein
Michael Angarano Robert Serber
David Rysdahl Donald Hornig
Louise Lombard Ruth Tolman
Emma Thomas Producer
Will Roberts George C. Marshall
Emma Dumont Jackie Oppenheimer
John Papsidera Casting
Harrison Gilbertson Philip Morrison
Jefferson Hall Haakon Chevalier
James Urbaniak Kurt Gödel
Josh Zuckerman Rossi Lomanitz
Bryce Johnson AAF Officer 2
Ludwig Göransson Original Music Composer
Claire Kaufman Set Decoration
Trond Fausa Aurvåg George Kistiakowsky
Macon Blair Lloyd Garrison
Flora Nolan Burn Victim
Harry Groener Senator McGee
Jeff Hephner Congressman
Kate French Presidential Aide
Charles Roven Producer
Ted King Senator Bartlett
Richard King Sound Designer
Pat Skipper James Byrnes
Christopher Denham Klaus Fuchs
Gary Rizzo Sound Re-Recording Mixer
Jeremy John Wells AAF Officer
Hans Bjerno Aerial Director of Photography
Brett DelBuono Concerned Scientist
Danny Deferrari Enrico Fermi
Jack Cutmore-Scott Lyall Johnson
Máté Haumann Leo Szilard
Mark Norby Stunts
Kevin O'Connell Sound Re-Recording Mixer
George Cottle Stunt Coordinator
John Gowans Ward Evans