Thursday the 12th is a four-part British television crime drama series, written by Paula Milne and directed by Charles Beeson. It has been screened internationally and shown in the United Kingdom at the British Film Institute, but has never been shown on British television. It was initially due to premiere on ITV1 in May 2000, but due to its political themes and proximity to that year's local elections, it was delayed due to concerns it would violate laws regarding political neutrality during election periods; efforts to broadcast it in June 2001 were cancelled for similar reasons, due to that year's general election.

The series focuses on the Bannister family, whose lives are turned upside down when an unidentified body is found in the grounds of their estate. As an investigative TV reporter takes on the case, Marius Bannister (Ciarán Hinds), a wealthy dentist and politician, his wife Nina (Maria Doyle Kennedy), their troubled adopted teenaged son Martin (Jim Sturgess), and Nina's predatory sister Candice Hopper (Elizabeth McGovern) all come under suspicion.