Deal or No Deal is a British game show, originally hosted by Noel Edmonds from 31 October 2005 to 23 December 2016 on Channel 4, and by Stephen Mulhern from 20 November 2023 onwards on ITV.

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 June 2020. Channel 4 rebroadcast some classic celebrity editions of the show during the afternoons on a Sunday. In October 2022, it was reported that ITV would be piloting a revived version of the show. After two pilot episodes were filmed at Dock10 studios on 1 December 2022, on 26 March 2023, ITV confirmed a new series with Stephen Mulhern taking over from Edmonds as host, premiering on 20 November 2023.