Deal or No Deal is a British game show. It was originally presented by Noel Edmonds from 31 October 2005 to 23 December 2016 on Channel 4, and then by Stephen Mulhern from 20 November 2023 on ITV1.

Based on the original Netherlands format of the game show, each episode sees a contestant choosing one of 22 boxes, each containing a cash amount. A contestant winning is determined by luck – cash amounts are randomly allocated to each of the boxes prior to the game, with contestants required to open a specific number of boxes per round of the game to eliminate the cash amounts their chosen box does not contain, in turn affecting how much is offered by the Banker. Games always end with the player opening all of the boxes, including their own, regardless of how they intend to make money.

On 19 August 2016, Channel 4 axed Deal or No Deal after almost 11 years on air, ending the game show with a special On Tour series across the United Kingdom, with the programme officially concluding on 23 December 2016. In 2022, six years later, two pilots were filmed at dock10 studios, following which ITV commissioned a revival series of twenty episodes to be broadcast on ITV1. The series premiered on 20 November 2023. On 29 January 2024, it was announced the revival was to be renewed for an extended second run by ITV alongside four celebrity specials. A third series will be broadcast in 2026.