Cillian Murphy is J. Robert Oppenheimer, Emily Blunt is Katherine ‘Kitty’ Oppenheimer, and Robert Downey Jr. is Lewis Strauss.
Main cast
- J. Robert OppenheimerCillian MurphySeasons FilmMain
- Katherine 'Kitty' OppenheimerEmily BluntSeasons FilmMain
- Leslie GrovesMatt DamonSeasons FilmMain
- Lewis StraussRobert Downey Jr.Seasons FilmMain
Supporting cast
- Jean TatlockFlorence PughSeasons FilmSupp
- Ernest LawrenceJosh HartnettSeasons FilmSupp
- David L. HillRami MalekSeasons FilmSupp
- Edward TellerBenny SafdieSeasons FilmSupp
- Boris PashCasey AffleckSeasons FilmSupp
- Niels BohrKenneth BranaghSeasons FilmSupp
- Gordon GrayTony GoldwynSeasons FilmSupp
- Roger RobbJason ClarkeSeasons FilmSupp
- Senate AideAlden EhrenreichSeasons FilmSupp
- CounselScott GrimesSeasons FilmSupp
- Isidor Isaac RabiDavid KrumholtzSeasons FilmSupp
- Albert EinsteinTom ContiSeasons FilmSupp
- Patrick BlackettJames D'ArcySeasons FilmSupp
- Harry TrumanGary OldmanSeasons FilmSupp
- Vannevar BushMatthew ModineSeasons FilmSupp
- Jackie OppenheimerEmma DumontSeasons FilmSupp
- Lloyd GarrisonMacon BlairSeasons FilmSupp
- Ward EvansJohn GowansSeasons FilmSupp
- Senator McGeeHarry GroenerSeasons FilmSupp
- Chairman MagnusonGregory JbaraSeasons FilmSupp
- Senator BartlettTed KingSeasons FilmSupp
- Senator PastoreTim DeKaySeasons FilmSupp
- Senator ScottSteven HouskaSeasons FilmSupp
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About this cast
Oppenheimer (2023) is Christopher Nolan’s epic biopic of the father of the atomic bomb. Cillian Murphy leads as J. Robert Oppenheimer, with Emily Blunt as his wife Kitty, Matt Damon as General Groves and Robert Downey Jr. as Lewis Strauss.
Cast FAQs
Who plays J. Robert Oppenheimer in Oppenheimer?
Cillian Murphy plays the physicist J. Robert Oppenheimer.
Who plays Lewis Strauss in Oppenheimer?
Robert Downey Jr. plays Lewis Strauss, a naval officer and official.
Who plays Kitty Oppenheimer in Oppenheimer?
Emily Blunt plays Katherine ‘Kitty’ Oppenheimer, the physicist's wife.
Who is in the cast of Oppenheimer?
The lead cast includes Cillian Murphy, Emily Blunt, Matt Damon and Robert Downey Jr., plus 23 supporting actors.
How many cast members are in Oppenheimer?
There are 27 cast members in total, with four lead roles and 23 supporting roles.
Sources: IMDb · IMDb · Encyclopaedia Britannica · Wikipedia · People · Updated June 2026