| Katheryn Winnick | Lagertha |
| Alexander Ludwig | Bjorn Lothbrok |
| Alex Høgh Andersen | Ivar |
| Marco Ilsø | Hvitserk |
| Jordan Patrick Smith | Ubbe |
| Danila Kozlovskiy | Oleg of Novgorod |
| Georgia Hirst | Torvi |
| Ragga Ragnars | Gunnhild |
| Lucy Martin | Ingrid |
| Martin Maloney | Vigrid |
| Bryan Quinn | One-Eyed Man |
| Kieran O'Reilly | White Hair |
| Kristy Dawn Dinsmore | Amma |
| Andrei Claude | Ganbaatar |
| Marko Leht | Torturer |
| Elodie Curry | Asa |
| Ryan Henson | Hali |
| Danny O'Connor | Messenger 1 |
| Michael Johnston | Messenger 2 |
| David Byrne | Bandit 1
(uncredited) |
| Katie Castle | Shield Maiden
(uncredited) |
| Stav Dvorkin | Collaborator
(uncredited) |
| Ruby O'Leary | Gyda
(archive footage) (uncredited) |
| Nathan O'Toole | Bjorn
(archive footage) (uncredited) |
| Mark Quigley | Kiev Noble
(uncredited) |
| Martin White | Bandit 2
(uncredited) |