| Travis Fimmel | Ragnar Lothbrok |
| Katheryn Winnick | Lagertha |
| Clive Standen | Rollo |
| Jessalyn Gilsig | Siggy Haraldson |
| Gustaf Skarsgård | Floki |
| George Blagden | Athelstan |
| Alexander Ludwig | Bjorn Lothbrok |
| Alyssa Sutherland | Princess Aslaug |
| Ben Robson | Kalf |
| Kevin Durand | The Wanderer |
| Linus Roache | King Ecbert |
| Amy Bailey | Princess Kwenthrith |
| Moe Dunford | Aethelwulf |
| Maude Hirst | Helga |
| Gaia Weiss | Porunn |
| Jefferson Hall | Torstein |
| Jennie Jacques | Judith |
| John Kavanagh | The Seer |
| Aaron Monaghan | Burgred |
| Lochlann O'Mearáin | First Noble
(as Lochlainn O Mearáinn) |
| Conor Ryan | Second Noble |
| Philip O'Sullivan | Bishop Edmund |
| Matthew O'Brien | Saxon #1 Farmstead |
| Ciaran McGlynn | Saxon #2 Farmstead |
| Lenny Hayden | Viking #1 Farmstead |
| Nigel O'Neill | Viking #2 Farmstead |
| Cathal O'Hallin | Hvitserk |
| Cormac Melia | Ubbe |
| Steve Wall | Einar |
| Laurence Falconer | Rider |
| Robert MacDomhnail | Viking Warrior
(uncredited) |
| Yuri Ribeiro | Viking Warrior
(uncredited) |