| Katheryn Winnick | Lagertha |
| Alexander Ludwig | Bjorn Lothbrok |
| John Kavanagh | The Seer |
| Peter Franzén | King Harald Finehair |
| Alex Høgh Andersen | Ivar
(as Alex Høgh) |
| Marco Ilsø | Hvitserk |
| Jordan Patrick Smith | Ubbe |
| Steven Berkoff | King Olaf the Stout |
| Georgia Hirst | Torvi |
| Ragga Ragnars | Gunnhild |
| Dean Ridge | Magnus |
| Kieran O'Reilly | White Hair |
| Alicia Agneson | Freydis |
| Ryan Henson | Hali |
| Svea Killoran | Asa |
| Kristy Dawn Dinsmore | Amma |
| Martin Maloney | Vigrid |
| Adam Behan | Ivar Scout
(uncredited) |
| Jordan Coombes | Shield Maiden
(uncredited) |
| Orlaith Doherty | Shield Maiden
(uncredited) |
| Joseph Duggan | Viking
(uncredited) |
| Karin Floengard Jonsson | Shield Maiden
(uncredited) |
| Laura Flynn | Shield Maiden
(uncredited) |
| Niamh Hogan | Shield Maiden
(uncredited) |
| Jinny Lofthouse | Shield Maiden
(uncredited) |
| John Mulvey | Viking
(uncredited) |
| Charles Sans | Dead Viking Elder
(uncredited) |
| Laura Sibbick | Shield Maiden
(uncredited) |