Trial & Retribution is a feature-length ITV police procedural television drama series that first aired on 19 October 1997. Written and devised by Lynda La Plante as a follow-on from her successful television series Prime Suspect, each episode was typically broadcast over two nights. David Hayman stars as the main protagonist of the series, DCS Michael "Mike" Walker. Throughout the series, he has two main sidekicks: DI Pat North (Kate Buffery) in Series 1–6 and DCI Róisín Connor (Victoria Smurfit) in Series 7–12.

The first seven series each contained two two-hour long episodes, covering one feature-length story. From series eight, the format was reduced to two 90-minute-long episodes. As of series ten, the format once again changed, incorporating multiple stories across one series. For the final two series, this format was retained; however, the length of the episodes was reduced to 60 minutes. The last episode was broadcast on 13 February 2009. The complete series was released on DVD on 14 July 2014.