Cillian MurphyJ. Robert Oppenheimer
Emily BluntKitty Oppenheimer
Robert Downey Jr.Lewis Strauss
Florence PughJean Tatlock
Josh HartnettErnest Lawrence
Kenneth BranaghNiels Bohr
Benny SafdieEdward Teller
Dylan ArnoldFrank Oppenheimer
James D'ArcyPatrick Blackett
David DastmalchianWilliam Borden
Dane DeHaanKenneth Nichols
Alden EhrenreichSenate Aide
Jefferson HallHaakon Chevalier
David KrumholtzIsidor Rabi
Matthew ModineVannevar Bush
Kurt KoehlerThomas Morgan
Macon BlairLloyd Garrison
Harry GroenerSenator McGee
Gregory JbaraChairman Magnuson
Steven HouskaSenator Scott
Petrie WillinkDutch Student
Matthias SchweighöferWerner Heisenberg
Josh ZuckermanRossi Lomanitz
Rory KeaneHartland Snyder
Michael AngaranoRobert Serber
Emma DumontJackie Oppenheimer
Sadie StrattonMary Washburn
Britt KyleBarbara Chevalier
Guy BurnetGeorge Eltenton
Tom JenkinsRichard Tolman
Louise LombardRuth Tolman
Michael Andrew BakerJoe Volpe
Olli HaaskiviEdward Condon
David RysdahlDonald Hornig
Josh PeckKenneth Bainbridge
Jack QuaidRichard Feynman
Brett DelBuonoConcerned Scientist
Gustaf SkarsgårdHans Bethe
Trond Fausa AurvågGeorge Kistiakowsky
Devon BostickSeth Neddermeyer
Danny DeferrariEnrico Fermi
Christopher DenhamKlaus Fuchs
Jessica Erin MartinCharlotte Serber
Ronald AugusteJ. Ernest Wilkins
Olivia ThirlbyLilli Hornig
Jack Cutmore-ScottLyall Johnson
Harrison GilbertsonPhilip Morrison
Will RobertsGeorge C. Marshall
Steve CoulterJames Conant
Jeremy John WellsAAF Officer
Bryce JohnsonAAF Officer 2
Kerry WestcottLaughing Woman
Christina HogueKissing Woman
Tyler BeardsleyWeeping Man
Maria Teresa ZuppettaConsoling Woman
Kate FrenchPresidential Aide
Hap LawrenceLyndon Johnson
Meg SchimelpfenigSenator's Assistant (uncredited)
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