Matt Damon Leslie Groves
Robert Downey Jr. Lewis Strauss
Christopher Nolan Director, Producer, Writer
Cillian Murphy J. Robert Oppenheimer
Emily Blunt Kitty Oppenheimer
Florence Pugh Jean Tatlock
Jack Quaid Richard Feynman
Rami Malek David Hill
Gary Oldman Harry Truman
Kenneth Branagh Niels Bohr
James Woods Executive Producer
Matthias Schweighöfer Werner Heisenberg
David Dastmalchian William Borden
Josh Hartnett Ernest Lawrence
James Remar Henry Stimson
Dane DeHaan Kenneth Nichols
Casey Affleck Boris Pash
Gustaf Skarsgård Hans Bethe
Tony Goldwyn Gordon Gray
Matthew Modine Vannevar Bush
Scott Grimes Counsel
Jason Clarke Roger Robb
Olivia Thirlby Lilli Hornig
Devon Bostick Seth Neddermeyer
Michael Angarano Robert Serber
James D'Arcy Patrick Blackett
David Krumholtz Isidor Rabi
Emma Thomas Producer
Guy Burnet George Eltenton
Alex Wolff Luis Alvarez
Alden Ehrenreich Senate Aide
Tom Conti Albert Einstein
Tim DeKay Senator Pastore
Josh Peck Kenneth Bainbridge
Steve Coulter James Conant
Louise Lombard Ruth Tolman
Michael Thurman Set Dresser
Josh Zuckerman Rossi Lomanitz
Benny Safdie Edward Teller
Trond Fausa Aurvåg George Kistiakowsky
Charles Roven Producer
Jeff Hephner Congressman
Jefferson Hall Haakon Chevalier
Emma Dumont Jackie Oppenheimer
Kevin O'Connell Sound Re-Recording Mixer
Ludwig Göransson Original Music Composer
Harrison Gilbertson Philip Morrison
Harry Groener Senator McGee
Gregory Jbara Chairman Magnuson
Willie D. Burton Production Sound Mixer
Jack Cutmore-Scott Lyall Johnson
Bryce Johnson AAF Officer 2
Flora Nolan Burn Victim
Dylan Arnold Frank Oppenheimer
Gary Rizzo Sound Re-Recording Mixer
David Rysdahl Donald Hornig
James Urbaniak Kurt Gödel
Hoyte van Hoytema Director of Photography
Christopher Denham Klaus Fuchs
Richard King Supervising Sound Editor, Sound Designer
Macon Blair Lloyd Garrison
Ted King Senator Bartlett
John Papsidera Casting
Pat Skipper James Byrnes
Scott R. Fisher Special Effects Supervisor
Dan O'Connell Foley Artist
Ellen Mirojnick Costume Design
Michael Andrew Baker Joe Volpe
Danny Deferrari Enrico Fermi
Ruth De Jong Production Design
Melinda Sue Gordon Still Photographer
Kate French Presidential Aide