Back is a British sitcom created by Simon Blackwell and starring David Mitchell and Robert Webb. It was broadcast on Channel 4 and ran for two series from 6 September 2017 to 25 February 2021. The programme was filmed and is set in and around Stroud, Gloucestershire.

A second series of six episodes was announced in November 2017; filming was scheduled to begin in October 2019. On 19 September 2020, Webb announced that the second series had finished filming, and began airing on 21 January 2021. The series premiered on Sundance Now in December 2017 before premiering on Sundance TV in the US in September 2018. The second season premiered on 31 March 2021 on sister network IFC in the US a week later after it premiered in full on Sundance Now on March 24.