Season 6 of Vikings was ordered by History on September 12, 2017. It will consist of 20 episodes. Additionally, series regular Katheryn Winnick is set to helm one episode in season six, marking her directorial debut.
Like the previous season, this season will also be split into two parts. On January 4, 2019, Deadline confirmed the rumors that Season 6 will indeed be its last. The first half premiered on December 4, 2019 as a double-episode premiere. The second half will premiere in late 2020.
- Katheryn Winnick as Former Queen Lagertha
- Alexander Ludwig as King Bjorn "Ironside"
- John Kavanagh as The Seer
- Alex Høgh Andersen as Ivar "the Boneless"
- Marco Ilsø as Hvitserk
- Jordan Patrick Smith as Ubbe
- Georgia Hirst as Torvi
- Ragga Ragnars as Gunnhild
- Eric Johnson as Erik
- Danila Kozlovsky as Grand Prince Oleg "the Prophet"
- Peter Franzén as Overking Harald
- Ray Stevenson as Othere
- Adam Copeland as Kjetill "Flatnose"
- Steven Berkoff as King Olaf "the Stout"
- Lucy Martin as Ingrid
- Lenn Kudrjawizki as Prince Dir
- Alicia Agneson as Katia
- Noah Syndergaard as Thorbjorn 
- Tristan McConnell as Jarl Hrolf / Geirr
- Russell Balogh as Bishop Aldulf
- Steve Cash as Wulfgar
- Brendan McCormack as Leof
- Seán McGillicuddy as Osric
- Oliver Price as Galan
- Fredrik Hiller as Jarl Thorkell
- Michael Hirst (20 Episodes)
- Steve Saint Leger (7 episodes)
- Daniel Grou (3 episodes)
- David Frazee (3 episodes)
- Helen Shaver (2 episodes)
- Katheryn Winnick (1 episode)
|6.01||70||"New Beginnings"||December 4, 2019|
|Bjorn struggles with the responsibilities of kingship and he finds he can't rely on his mother, Lagertha; Ivar falls into the hands of the Kievan Rus, and in their ruthless and unpredictable ruler, Prince Oleg, he may finally have met his match.|
|6.02||71||"The Prophet"||December 4, 2019|
|Messengers arrive in Kattegat with news that presents Bjorn with a dilemma; Prince Oleg of Kiev seems untroubled by his conscience; Lagertha has settled into her new, peaceful life, but danger lurks nearby.|
|6.03||72||"Ghosts, Gods, and Running Dogs"||December 11, 2019|
|Several women join Lagertha for a happy feast until a series of startling events send shockwaves through the community and force Lagertha to act; Ivar is wary of Oleg's potential threat to both himself and the throne's vulnerable young heir.|
|6.04||73||"All The Prisoners"||December 18, 2019|
|Lagertha leads her village’s response to the recent attacks but despite her best efforts, when the inevitable attack comes, the consequences are tragic. Olaf has a bold new plan for the future of Norway. In Kiev, although Ivar discusses Oleg’s ambitions for Scandinavia, he’s actually more interested in the plight of Igor, the young heir who Oleg controls.|
|6.05||74||"The Key"||January 1, 2020|
|King Olaf feels confident about the result of the election of the King of all Norway as the kings and jarls visit Harald's territory; Lagertha's village is abuzz due to bandit attacks; Ivar is forced to confront an unfortunate element of his past.|
|6.06||75||"Death and the Serpent"||January 8, 2020|
|Bjorn is forced to act quickly in the aftermath of the election for the King of all Norway; the bandits attack Lagertha's village again; Hvitserk continues to unravel.|
|6.07||76||"The Ice Maiden"||January 15, 2020|
|Bjorn returns to Kattegat; Harald gains a measure of revenge on Olaf; in Kiev, interesting news reaches Ivar and Igor about Prince Dir.|
|6.08||77||"Valhalla Can Wait"||January 22, 2020|
|Bjorn faces a hard decision. Torvi and Ubbe leave Kattegat in search of new lands.|
|6.09||78||"Resurrection"||January 29, 2020|
|In Iceland, Ubbe and Torvi finally meet a mysterious wanderer. Bjorn is forced to re-think who his enemies are when Erik returns from a scouting mission with worrying information. Bjorn will need allies, but he may not be able to convince his old foe, King Harald, to join forces in the face of the new threat. Ivar is reunited with someone close to him.|
|6.10||79||"The Best Laid Plans"||February 5, 2020|
|Ivar and Igor plot against Oleg but are still part of the force that departs Kiev to invade Scandinavia; King Harald and King Bjorn begin furious preparations for the invasion; it is uncertain if enough has been done to resist the Rus force.|
- Katheryn Winnick, John Kavanagh, Jordan Patrick Smith, Georgia Hirst, Ragga Ragnars, Eric Johnson, Peter Franzén, and Ray Stevenson are only credited for their respective episode appearances. In addition, Hirst and Ragnars also recurred in the first eight episodes.
- Season 6 marks the only season to feature new series regulars Georgia Hirst, Ragga Ragnars, Eric Johnson, Danila Kozlovsky and Ray Stevenson.
- The upcoming DVD and Blu-ray releases for both parts of Season 6 will be released through Warner Home Entertainment, whose sister company Turner Entertainment once owned MGM's pre-May 1986 library, instead of 20th Century Fox at the time MGM's distribution deal expired a year after Fox was acquired by The Walt Disney Company.