Thirteen is a British drama serial created and written by Marnie Dickens. The series centres on Ivy Moxam (Jodie Comer), a 26-year-old woman who escapes from the cellar where she has been imprisoned for 13 years, and the impact on her family.

The first episode was released on BBC Three in the UK on 28 February 2016. It began airing on BBC America in the United States on 23 June 2016. Each episode was broadcast on BBC Two a week after its release, with the first on 6 March 2016. In Saudi Arabia and the rest of the Middle East, the series began airing in the middle of August 2016.

On 27 March 2016, Dickens stated that there would not be a second series of the show as it was intended to be a one-off.