| Travis Fimmel | Ragnar Lothbrok |
| Katheryn Winnick | Lagertha |
| Alyssa Sutherland | Queen Aslaug |
| John Kavanagh | The Seer |
| Moe Dunford | Aethelwulf |
| Alex Høgh Andersen | Ivar
(as Alex Høgh) |
| David Lindström | Sigurd |
| Jordan Patrick Smith | Ubbe |
| Linus Roache | King Ecbert |
| Josefin Asplund | Astrid |
| Ida Nielsen | Margrethe
(as Ida Marie Nielsen) |
| Georgia Hirst | Torvi |
| Jennie Jacques | Judith |
| Paul Booth | Saxon Officer |
| Chris McHallem | Saxon Noble |
| Cameron Hogan | Magnus |
| Isaac O'Sullivan | Alfred |
| Lianne Bowley | Shield Maiden
(uncredited) |
| Katie Castle | Shield Maiden
(uncredited) |
| Amy Donnelly | Shield Maiden
(uncredited) |
| Kristine Kenina | Shield Maiden
(uncredited) |
| Celine Nihicidhe | Shield Maiden
(uncredited) |
| Michelle O'Flaherty | Shield Maiden
(uncredited) |
| Laura Sibbick | Shield Maiden
(uncredited) |