- Domhnall Gleeson as Caleb Smith, a programmer at Blue Book.
- Oscar Isaac as Nathan Bateman, the CEO of Blue Book.
- Alicia Vikander as Ava, an artificial intelligence and android created by Nathan.
- Sonoya Mizuno as Kyoko, the in-house attendant of Nathan.
- Gana Bayarsaikhan as Jade, an earlier gynoid prototype.
- Corey Johnson as Jay, the helicopter pilot.
- Claire Selby as Lily, an earlier gynoid prototype.
- Symara Templeman as Jasmine, an earlier gynoid prototype.
- Tiffany Pisani as Katya
- Lina Alminas as Amber
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