Hard Sun is a pre-apocalyptic British crime drama television series, created and written by Neil Cross, starring Agyness Deyn and Jim Sturgess as the principal characters, DI Elaine Renko and DCI Charlie Hicks. The series is a BBC co-production with the American streaming service Hulu.

The series contains six episodes. It premiered on BBC One on 6 January 2018, with all six episodes subsequently available on the same day via BBC iPlayer. The series premiered on Hulu in the United States on 7 March 2018. The series has also been acquired by the Seven Network in Australia, ZDF in Germany and SVT in Sweden. The first series was released on DVD and Blu-ray on 19 February 2018. The show was inspired by the David Bowie song "Five Years".

Writer Neil Cross has since expressed his wish to continue the series beyond its first run, claiming he has sketched out a potential five-year story arc. It was cancelled after one season.