King Charles III is a 2017 future history television film adapted by Mike Bartlett from his play of the same title. It is directed by Rupert Goold, director of the original play, and stars most of the play's original cast including Tim Pigott-Smith, who died before the film was broadcast, as Charles.

Written in blank verse and set in the future, the film focuses on the reign of the real life Charles III (who at the time of the film's release was Prince of Wales) and the surrounding political drama as a result of his accession to the throne. It was broadcast on 10 May 2017 on BBC Two in the UK, before being broadcast on 14 May 2017 on PBS Masterpiece in the US. A DVD of the film was released in the UK on 15 May 2017.

The film received two nominations at the 2018 British Academy Television Awards: Best Single Drama and Best Actor for Pigott-Smith.