Alexander Skarsgård as Amleth, a Viking warrior prince.

Oscar Novak as young Amleth^[6]

Nicole Kidman as Queen Gudrún, Amleth's mother

Claes Bang as Fjölnir the Brotherless, Amleth's uncle and Aurvandill's brother.

Anya Taylor-Joy as Olga of the Birch Forest, a Slavic sorceress

Ethan Hawke as King Aurvandill War-Raven, Amleth's father and Fjölnir's brother.

Gustav Lindh as Thorir the Proud, Fjölnir's elder son and Amleth's cousin

Elliott Rose as Gunnar, Fjölnir's younger son and Amleth's half brother

Willem Dafoe as Heimir the Fool

Björk as the Seeress

Eldar Skar as Finnr the Nose-Stub, Fjölnir's foreman

Olwen Fouéré as Ashildur Hofgythja, the priestess of Fjölnir's estate

Ingvar Eggert Sigurðsson as He-witch

Ian Whyte as the Mound Dweller

Hafþór Júlíus Björnsson as Thorfinnr Tooth-Gnasher, Hákon's champion

Kate Dickie as Halldora the Pict, a slave on Fjölnir's farm

Tadhg Murphy as Eirikr Blaze-Eye, Amleth's fellow viking

Ralph Ineson as Captain Volodymyr, a Rus sea captain

Murray McArthur as Hákon Ironbeard, chieftain of the neighboring farm

Ineta Sliuzaite as the Valkyrja