Miss Scarlet and The Duke is a British-American period television crime drama created by Rachael New, starring Kate Phillips and Stuart Martin as the title characters, two Victorian era detectives.

The first series debuted on Alibi in the United Kingdom on 31 March 2020, and premiered in the United States on 17 January 2021, as part of PBS's Masterpiece anthology series. A second series was announced by PBS on 29 March 2021. It premiered on Alibi in the UK on 14 June 2022, and on PBS in the US on 16 October 2022. The show was later renewed for series three and four, with series three premiering on PBS on 8 January 2023, and season four premiering on PBS on 7 January 2024.

It was announced in the United States on 29 February 2024, on PBS's Masterpiece website, that Miss Scarlet and the Duke would be renewed for a fifth series. The announcement also contained the news that the show would be retitled simply Miss Scarlet, with Stuart Martin as "the Duke" departing the show. He will be replaced by Tom Durant Pritchard as Inspector Alexander Blake.