Marcella is a British Nordic noir detective series, written, directed and produced by Swedish screenwriter Hans Rosenfeldt, creator of The Bridge. The series is produced by Buccaneer Media for ITV and distributed worldwide by Buccaneer's parent company Cineflix. It was first shown on ITV on 4 April 2016, with seven further episodes released weekly.

The series stars Anna Friel as Marcella Backland, a former London detective who returns to work to investigate an open case from 11 years earlier involving an unidentified serial killer who appears to have become active again. She has a hectic home life as her husband, Jason (Nicholas Pinnock), has decided to leave her and their two children are in boarding school. Nina Sosanya (series one), Ray Panthaki and Jamie Bamber are also credited as principal members of the cast.

The series was commissioned in June 2015, with location filming taking place in London and the Port of Dover. After their first release on ITV, the episodes were made available to stream on Netflix outside the United Kingdom. The first series was released on DVD via Universal Pictures UK on 20 June 2016. In 2017, Friel was awarded the International Emmy Award for Best Actress for her performance in Marcella.

On 26 August 2016, ITV announced that a second series had been commissioned. The second series premiered on 19 February 2018 and was released on DVD on 16 April 2018. On 3 October 2018 it was announced that Marcella would be returning to ITV for a third series. It premiered internationally on Netflix on 14 June 2020, and began airing on ITV in the UK on 26 January 2021; it was also expected to be released on DVD in March 2021.