| Travis Fimmel | Ragnar Lothbrok |
| Katheryn Winnick | Lagertha |
| Clive Standen | Rollo |
| Gustaf Skarsgård | Floki |
| Alexander Ludwig | Bjorn Lothbrok |
| Alyssa Sutherland | Queen Aslaug |
| Ben Robson | Kalf |
| Lothaire Bluteau | Emperor Charles |
| Peter Franzén | King Harald Finehair |
| Jasper Pääkkönen | Halfdan the Black |
| Linus Roache | King Ecbert |
| Amy Bailey | Queen Kwenthrith |
| Dianne Doan | Yidu |
| Moe Dunford | Aethelwulf |
| Maude Hirst | Helga |
| Ivan Kaye | King Aelle |
| Owen Roe | Count Odo |
| Edvin Endre | Erlendur |
| Georgia Hirst | Torvi |
| Jennie Jacques | Judith |
| Seán T. Ó Meallaigh | Prudentius |
| Morgane Polanski | Princess Gisla |
| Des Carney | Waerferth the Scout |
| Conor O'Hanlon | Alfred |
| Huw Parmenter | Roland |
| Karen Hassan | Therese |
| Philip O'Sullivan | Bishop Edmund |
| Stephen Rockett | Hvitserk |
| Luke Shanahan | Ubbe |
| James Quinn Markey | Ivar |
| Elijah O'Sullivan | Sigurd |
| Maxim Boshell | Ivar's Axe Boy |
| Amy Donnelly | Shield Maiden |
| Hannah Behan | Shield Maiden
(uncredited) |
| Katie Castle | Shield Maiden
(uncredited) |
| Jordan Coombes | Shield Maiden
(uncredited) |
| Joseph Duggan | Viking
(uncredited) |
| Aisling Goodwin | Shield Maiden
(uncredited) |
| Kristine Kenina | Shield Maiden
(uncredited) |
| Tom Leavey | Warrior
(uncredited) |
| Celine Nihicidhe | Shield Maiden
(uncredited) |
| Michelle O'Flaherty | Shieldmaden
(uncredited) |
| Eimear O'Grady | Shield Maiden
(uncredited) |
| Laura Sibbick | Shield Maiden
(uncredited) |