| Katheryn Winnick | Lagertha |
| Gustaf Skarsgård | Floki |
| Alexander Ludwig | Bjorn Lothbrok |
| 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 |
| Conor Lambert | Viking Trader |
| Gary Murphy | Bishop Unwan |
| Rob Walsh | Aelle's Cleric |
| Philip O'Sullivan | Bishop Edmund |
| Isaac O'Sullivan | Alfred |
| Olga Wehrly | Saxon Woman |
| Lee Hunter | Saxon Scout |
| Sinead Gormally | Tanaruz |
| Adam Goodwin | Saxon Noble |
| Charlie Kelly | Egil |
| Sophie Vavasseur | Princess Ellisif |
| Gary Buckley | Vik (Ellisif's Husband) |
| Siobhan Kelly | Egil's Wife |
| Peter Dillon | Viking Scout |
| Hannah Behan | Shield Maiden
(uncredited) |
| Lianne Bowley | Shield Maiden
(uncredited) |
| Katie Castle | Shield Maiden
(uncredited) |
| Jordan Coombes | Shield Maiden
(uncredited) |
| Laura Flynn | Shield Maiden
(uncredited) |
| Conor Hegarty | Viking
(uncredited) |
| Kristine Kenina | Shield Maiden
(uncredited) |
| Eimear O'Grady | Shield Maiden
(uncredited) |
| Charles Sans | Viking Elder
(uncredited) |
| Laura Sibbick | Shield Maiden
(uncredited) |
| Melody Sorensen | Kattegonian
(uncredited) |
| Gemma Weston | Shield Maiden
(uncredited) |
| Lauterio Zamparelli | Viking
(uncredited) |