| Travis Fimmel | Ragnar Lothbrok |
| Clive Standen | Rollo |
| Gustaf Skarsgård | Floki |
| Alexander Ludwig | Bjorn Lothbrok |
| Alyssa Sutherland | Queen Aslaug |
| Linus Roache | King Ecbert |
| Amy Bailey | Queen Kwenthrith |
| George Blagden | Athelstan |
| Moe Dunford | Aethelwulf |
| Maude Hirst | Helga |
| Owen Roe | Count Odo |
| Jennie Jacques | Judith |
| Seán T. Ó Meallaigh | Prudentius
(as Sean T. O' Meallaigh) |
| Morgane Polanski | Princess Gisla |
| Mark Fitzgerald | Warrior |
| David Shannon | Noble 1 |
| Chris McHallem | Noble 2 |
| Malcolm Douglas | Noble 3 |
| Stephen Rockett | Hvitserk |
| Luke Shanahan | Ubbe |
| Rosalie Connerty | Angrboda |
| Des Carney | Waerferth the Scout |
| Conor O'Hanlon | Alfred |
| Huw Parmenter | Roland |
| Karen Hassan | Therese |
| Paul Ward | Hairdresser |
| Philip O'Sullivan | Bishop Edmund |
| James Quinn Markey | Ivar |
| Aron Hegarty | Mercian Commander |
| Tom Leavey | Warrior
(uncredited) |
| Michelle O'Flaherty | Shieldmaden
(uncredited) |
| Caroline Simonnet | Mercian Guard
(uncredited) |
| Gemma Weston | Mercian Guard
(uncredited) |