Britannia is a British historical fantasy drama television series created by Jez Butterworth and Tom Butterworth. The show was the first co-production between Sky UK and Amazon Prime Video and stars Kelly Reilly, David Morrissey, Zoë Wanamaker, Mackenzie Crook, Nikolaj Lie Kaas, and Eleanor Worthington Cox. It first aired on Sky Atlantic in the UK beginning 18 January 2018 and on Amazon Prime Video in the US beginning 26 January 2018. The first series aired on Epix beginning 2 August 2020. Pop songs were used as theme music for the three series to date: Donovan's "Hurdy Gurdy Man", his "Season of the Witch", and "Children of the Revolution" by T. Rex. In March 2023, the series was cancelled after three seasons.

Jeremy "Jez" Butterworth is an English playwright, screenwriter, and film director. He has written screenplays in collaboration with his brothers, John-Henry and Tom.