| Katheryn Winnick | Lagertha |
| Alexander Ludwig | Bjorn Lothbrok |
| John Kavanagh | The Seer |
| Alex Høgh Andersen | Ivar |
| Marco Ilsø | Hvitserk |
| Jordan Patrick Smith | Ubbe |
| Danila Kozlovskiy | Oleg of Novgorod |
| Peter Franzén | King Harald Finehair |
| Adam Copeland | Kjetill Flatnose |
| Lenn Kudrjawizki | Prince Dir |
| Georgia Hirst | Torvi |
| Steven Berkoff | King Olaf the Stout |
| Ragga Ragnars | Gunnhild |
| Lucy Martin | Ingrid |
| Alicia Agneson | Katia |
| Fredrik Hiller | Jarl Thorkell |
| Elodie Curry | Asa |
| Aoibheann McCann | Skadi |
| Kristy Dawn Dinsmore | Amma |
| Gina Costigan | Runa |
| Kathy Monahan | Eira |
| Eve Connolly | Thora |
| Amy De Bhrún | Jarl Hrolf
(as Amy De Braún) |
| Mishaël Lopes Cardozo | King Hakon |
| Oran Glynn O'Donovan | Igor |
| Neil Keery | Alexei |
| Serena Kennedy | Anna |
| Patrick O'Donnell | Dealer |
| Pellek | Envoy
(as Per Fredrik Åsly) |
| Jordan Coombes | Shield Maiden
(uncredited) |
| Orlaith Doherty | Shield Maiden
(uncredited) |
| Karin Floengard Jonsson | Shield Maiden
(uncredited) |
| Brian Kearns | Viking Warrior
(uncredited) |
| Jinny Lofthouse | Hild
(uncredited) |