Video nasty is a colloquial term popularised by the National Viewers' and Listeners' Association (NVALA) in the United Kingdom to refer to a number of films, typically low-budget horror or exploitation films, distributed on video cassette that were criticised for their violent content by the press, social commentators and various religious organisations in the early 1980s. These video releases were not brought before the British Board of Film Classification (BBFC) due to a loophole in film classification laws that allowed videos to bypass the review process. The resulting uncensored video releases led to public debate concerning the availability of these films to children due to the unregulated nature of the market.

Following a campaign led by Mary Whitehouse and the NVALA, prosecutions were commenced against individuals engaged in trades exploiting allegedly obscene videos. To assist local authorities in identifying obscene films, the Director of Public Prosecutions released a list of 72 films the office believed to violate the Obscene Publications Act 1959. This list included films that had either been previously acquitted of obscenity or already obtained BBFC certification. In addition, a second list was released that contained an additional 82 titles which were not believed to lead to obscenity convictions but could nonetheless be confiscated under the Act's forfeiture laws. The resultant confusion regarding the definition of obscene material led to Parliament passing the Video Recordings Act 1984, which required certification of video releases by the BBFC.

The implementation of the Video Recording Act imposed a stricter code of censorship on videos than was required for cinema release. Several major studio productions were banned on video, as they fell within the scope of legislation designed to control the distribution of video nasties. In recent years, the stricter requirements have been relaxed, as numerous films once considered video nasties have obtained certification uncut or with minimal edits. Due to a legislative mistake discovered in August 2009, the Video Recordings Act 1984 was repealed and re-enacted without change by the Video Recordings Act 2010.