Vikings will end with its sixth season in 2020, culminating in total of 89 episodes.
The Canadian-Irish production will again split its season in 2 x 10 episodes, due to begin later this year.
But creator Michael Hirst is in talks about a franchise continuation with studio MGM Television.
The historical drama, which debuted in 2013 with Aussie Travis Fimmel, is the History Channel’s best performing scripted series of all time.
Season 5 is currently screening in Australia on SBS.