Florence Pugh Jean Tatlock
Robert Downey Jr. Lewis Strauss
Emily Blunt Kitty Oppenheimer
Matt Damon Leslie Groves
Christopher Nolan Director, Producer, Writer
Gary Oldman Harry Truman
Kenneth Branagh Niels Bohr
Cillian Murphy J. Robert Oppenheimer
Josh Hartnett Ernest Lawrence
Casey Affleck Boris Pash
Rami Malek David Hill
James D'Arcy Patrick Blackett
Jason Clarke Roger Robb
Olivia Thirlby Lilli Hornig
Gustaf Skarsgård Hans Bethe
Dane DeHaan Kenneth Nichols
Jack Quaid Richard Feynman
James Remar Henry Stimson
David Dastmalchian William Borden
Matthias Schweighöfer Werner Heisenberg
Michael Angarano Robert Serber
Tony Goldwyn Gordon Gray
James Woods Executive Producer
Tom Conti Albert Einstein
Benny Safdie Edward Teller
Alex Wolff Luis Alvarez
Matthew Modine Vannevar Bush
David Krumholtz Isidor Rabi
Alden Ehrenreich Senate Aide
Dylan Arnold Frank Oppenheimer
Josh Peck Kenneth Bainbridge
Josh Zuckerman Rossi Lomanitz
Devon Bostick Seth Neddermeyer
Jefferson Hall Haakon Chevalier
Ludwig Göransson Original Music Composer
Louise Lombard Ruth Tolman
Scott Grimes Counsel
Brett DelBuono Concerned Scientist
Harrison Gilbertson Philip Morrison
Emma Thomas Producer
John Papsidera Casting
Guy Burnet George Eltenton
Christopher Denham Klaus Fuchs
Emma Dumont Jackie Oppenheimer
David Rysdahl Donald Hornig
Trond Fausa Aurvåg George Kistiakowsky
Harry Groener Senator McGee
James Urbaniak Kurt Gödel
Flora Nolan Burn Victim
Jack Cutmore-Scott Lyall Johnson
Steve Coulter James Conant
Hoyte van Hoytema Director of Photography
Gregory Jbara Chairman Magnuson
Macon Blair Lloyd Garrison
Anthony Molinari Stunts
Tim DeKay Senator Pastore
Christopher Flick Foley Editor
Ted King Senator Bartlett
Jeff Hephner Congressman
George Cottle Stunt Coordinator
Danny Deferrari Enrico Fermi
Bryce Johnson AAF Officer 2
Kate French Presidential Aide
Jolene Van Vugt Stunt Driver
Richard King Supervising Sound Editor, Sound Designer
Pat Skipper James Byrnes
Cabe Thompson Extras Casting
Kurt Koehler Thomas Morgan
Willie D. Burton Production Sound Mixer
John T. Cucci Foley Artist
Sadie Stratton Mary Washburn
Dan O'Connell Foley Artist