| Travis Fimmel | Ragnar Lothbrok |
| Katheryn Winnick | Lagertha |
| Clive Standen | Rollo |
| Gustaf Skarsgård | Floki |
| George Blagden | Athelstan |
| Alexander Ludwig | Bjorn Lothbrok |
| Alyssa Sutherland | Princess Aslaug |
| Ben Robson | Kalf |
| Lothaire Bluteau | Emperor Charles |
| Linus Roache | King Ecbert |
| Moe Dunford | Aethelwulf |
| Maude Hirst | Helga |
| Owen Roe | Count Odo |
| Jennie Jacques | Judith |
| Morgane Polanski | Princess Gisla |
| Mark Huberman | Louis |
| Anthony Kinahan | French Sentry |
| Rex Ryan | Soldier |
| Colm O'Brien | Tower Sentry |
| Frankie McCafferty | Sinric |
| Greg Orvis | Siegfried |
| Huw Parmenter | Roland |
| Eddie Drew | Odin |
| Carl Shaaban | Jesus |
| Vincenzo Di Tommaso | Terrifying Creature |
| Joe Doyle | 1st Older Viking Man |
| Brian McGuinness | 2nd Older Viking Man |
| James Murphy | Ansgar |
| Karen Hassan | Therese |
| Edvin Endre | Erlendur |
| Ciaran O'Grady | Viking Man |
| Laurence Foster | French Archbishop |
| Katie Castle | Shield Maiden
(uncredited) |
| Tony Condren | Executioner
(uncredited) |
| Jordan Coombes | Shield Maiden
(uncredited) |
| Tom Leavey | Noble
(uncredited) |
| Robert MacDomhnail | Viking Warrior
(uncredited) |
| Michelle O'Flaherty | Shield Maiden
(uncredited) |
| Gemma Weston | Shield Maiden
(uncredited) |