The Investigator: A British Crime Story is a British television crime documentary series, created and produced by Simon Cowell, and presented by Mark Williams-Thomas. The series, broadcast on ITV, is often described as "Britain's answer to Making a Murderer", and was inspired by Cowell's viewing of the documentary series The Jinx.

The first series, comprising four episodes, first broadcast in July and August 2016, focused on the murder of Carole Packman, who disappeared in 1985. The second series, comprising three episodes, first broadcast in April 2018 and looks into a number of unsolved disappearances and murders that could be linked to convicted serial killers Peter Tobin and Angus Sinclair.

The series also features a number of dramatised scenes filmed to portray key events in each of the cases featured, drawing inspiration from the reconstructive element of Crimewatch. The series was broadcast on Netflix internationally until the 21st August 2021.