Suspicion is a two-part British television drama thriller, written by Peter Whalley and directed by Jamie Payne, that first broadcast on ITV between 8 and 9 September 2003. The series stars Amanda Redman as Carol Finnegan, a schoolteacher whose marriage of twenty years is threatened by a number of anonymous e-mails from an unidentified party only known as 'The Truth Teller', who claims her husband Mark (Adrian Dunbar) has been having an affair with his secretary, Rebecca (Claudia Harrison). When Claudia is found later found murdered, both Carol and Mark come under suspicion from the police.

The first episode of Suspicion attracted 8.56 million viewers, while the concluding episode attracted 8.31. In the United States, the series was edited down to three episodes, each of fifty minutes in length. Suspicion was released on Region 1 DVD in the United States on 3 October 2006 via Koch Vision, but remains unreleased on Region 2 DVD.