Matt Damon Leslie Groves
Gary Oldman Harry Truman
Emily Blunt Kitty Oppenheimer
Robert Downey Jr. Lewis Strauss
Christopher Nolan Director, Producer, Writer
Cillian Murphy J. Robert Oppenheimer
Florence Pugh Jean Tatlock
Jack Quaid Richard Feynman
Rami Malek David Hill
Tony Goldwyn Gordon Gray
Matthias Schweighöfer Werner Heisenberg
James Remar Henry Stimson
Kenneth Branagh Niels Bohr
James D'Arcy Patrick Blackett
David Krumholtz Isidor Rabi
Josh Hartnett Ernest Lawrence
Devon Bostick Seth Neddermeyer
Casey Affleck Boris Pash
Willie D. Burton Production Sound Mixer
Emma Thomas Producer
Michael Angarano Robert Serber
Paul Crow Willis Key Rigging Grip
James Woods Executive Producer
Dane DeHaan Kenneth Nichols
Easton Michael Smith Set Designer
Trond Fausa Aurvåg George Kistiakowsky
Jo Kissack Folsom Assistant Costume Designer
Scott Grimes Counsel
Olivia Thirlby Lilli Hornig
Gustaf Skarsgård Hans Bethe
Melinda Sue Gordon Still Photographer
Jason Clarke Roger Robb
David Dastmalchian William Borden
Matthew Modine Vannevar Bush
Alden Ehrenreich Senate Aide
James A. Brewer Assistant Editor
Alex Wolff Luis Alvarez
Benny Safdie Edward Teller
Scott R. Fisher Special Effects Supervisor
Guy Burnet George Eltenton
Jaime Leigh McIntosh Hair Department Head
Jack Cutmore-Scott Lyall Johnson
Ruth De Jong Production Design
Tim DeKay Senator Pastore
Keith B. Davis First Assistant "A" Camera
Josh Peck Kenneth Bainbridge
Dan O'Connell Foley Artist
Jefferson Hall Haakon Chevalier
Steve Coulter James Conant
Josh Zuckerman Rossi Lomanitz
Tom Conti Albert Einstein
James Urbaniak Kurt Gödel
Jeff Hephner Congressman
Dylan Arnold Frank Oppenheimer
Gregory Jbara Chairman Magnuson
Christopher Denham Klaus Fuchs
Louise Lombard Ruth Tolman
Kevin O'Connell Sound Re-Recording Mixer
M. Shane Cates Grip
Ludwig Göransson Original Music Composer
Emma Dumont Jackie Oppenheimer
Richard King Supervising Sound Editor, Sound Designer
Ellen Mirojnick Costume Design
Justin O'Neal Miller Set Designer
John Papsidera Casting
Christopher Flick Foley Editor
David Rysdahl Donald Hornig
Harrison Gilbertson Philip Morrison
Gary Rizzo Sound Re-Recording Mixer
Danny Downey Stunts
Mark Norby Stunts
Pat Skipper James Byrnes