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