Do Not Adjust Your Set (DNAYS) is a British television series produced originally by Rediffusion, London, then, by the fledgling Thames Television for British commercial television channel ITV from 26 December 1967 to 14 May 1969. The show took its name from the message that was displayed when there was a problem with transmission or technical difficulties.

Associated-Rediffusion, later Rediffusion London, was the British ITV franchise holder for London and parts of the surrounding counties, on weekdays between 22 September 1955 and 29 July 1968. It was the first ITA franchisee to go on air, and one of the "Big Four" companies that between them produced the majority of ITV networked programmes during this period.