Trick or Treat is a British television show hosted by Derren Brown produced by Objective Productions and broadcast on Channel 4. The first episode was broadcast on 13 April 2007. The focus of the show is on one person selected from a pool of volunteers who responded to adverts in the national press to take part in the show. The experience the volunteer receives is decided by which card they choose. If they choose the card that says 'Trick' they receive a bad experience and if they choose the card that says 'Treat' they receive a good experience. This distinction is not always obvious, however: in Series 2, a participant's dark experience of being persuaded to (supposedly) kill a kitten was a 'treat' because of the positive attitude to life Derren believed she would consequently develop; similarly, a volunteer who chose a 'trick' was kidnapped, but had been taught escapology techniques which enabled her to easily escape.

Episodes of Trick or Treat are not preceded by Brown's usual claim that no actors or stooges were used in the filming of the shows. Indeed, some participants (such as the ambulance crew in the final episode of Series 1) are declared to be actors.