| Travis Fimmel | Ragnar Lothbrok |
| Katheryn Winnick | Lagertha |
| Clive Standen | Rollo |
| Gustaf Skarsgård | Floki |
| Alexander Ludwig | Bjorn Lothbrok |
| Alyssa Sutherland | Queen Aslaug |
| Peter Franzén | King Harald Finehair |
| Jasper Pääkkönen | Halfdan the Black |
| Moe Dunford | Aethelwulf |
| Alex Høgh Andersen | Ivar
(as Alex Høgh) |
| Marco Ilsø | Hvitserk |
| David Lindström | Sigurd |
| Jordan Patrick Smith | Ubbe |
| Linus Roache | King Ecbert |
| Josefin Asplund | Astrid |
| Maude Hirst | Helga |
| Ida Nielsen | Margrethe
(as Ida Marie Nielsen) |
| Georgia Hirst | Torvi |
| Jennie Jacques | Judith |
| Morgane Polanski | Princess Gisla |
| Jack Olohan | Viking Farmer |
| Liam Clarke | Gudmund |
| Ed Murphy | Gardar |
| Amy Hughes | Shield Maiden |
| Charles Last | William Son of Rollo |
| Caoimhe Garvin | Young Saxon Girl |
| Michael Power | Captain of the Guard |
| Chris McHallem | Saxon Noble |
| Jack Walsh | Scotus |
| Paul Booth | Saxon Officer |
| Hannah Behan | Shield Maiden
(uncredited) |
| Lianne Bowley | Shield Maiden
(uncredited) |
| Katie Castle | Shield Maiden
(uncredited) |
| Amy Donnelly | Shield Maiden
(uncredited) |
| Laura Flynn | Shield Maiden
(uncredited) |
| Aisling Goodwin | Shield Maiden
(uncredited) |
| Kristine Kenina | Shield Maiden
(uncredited) |
| Celine Nihicidhe | Shield Maiden
(uncredited) |
| Michelle O'Flaherty | Shield Maiden
(uncredited) |
| Laura Sibbick | Shield Maiden
(uncredited) |
| Gemma Weston | Shield Maiden
(uncredited) |