Mahmood Hussein Mattan (1923 – 3 September 1952) was a British Somali former merchant seaman who was wrongfully convicted of the murder of Lily Volpert on 6 March 1952. The murder took place in the Docklands area of Cardiff, Wales, and Mattan was mainly convicted on the evidence of a single prosecution witness. Mattan was executed in 1952. His conviction was quashed 45 years later on 24 February 1998, his case being the first to be referred to the Court of Appeal by the newly formed Criminal Cases Review Commission.