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 pure luck – cash amounts are randomly allocated to each of the boxes before each 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 eleven series, ending the game show with a special Deal or No Deal on Tour series across the United Kingdom, with the programme officially concluding after 11 years on 23 December 2016. In December 2022, six years later, ITV recorded two pilots at dock10 with Stephen Mulhern as host for a possible revival of the show. On 26 March 2023, the pilots were received so well by ITV that they confirmed a revival of the show for a twenty-episode run. The new series premiered on 20 November 2023. On 29 January 2024, the revival was renewed for an extended second run by ITV alongside four celebrity specials.