Folk horror is a subgenre of horror film and horror fiction that uses elements of folklore to invoke fear and foreboding. Typical elements include a rural setting, isolation, and themes of superstition, folk religion, paganism, sacrifice and the dark aspects of nature. Although related to supernatural horror film, folk horror usually focuses on the beliefs and actions of people rather than the supernatural, and often deals with naïve outsiders coming up against these. The British films Blood on Satan's Claw (1971), The Wicker Man (1973) and Witchfinder General (1968) are regarded as pioneers of the genre, while the The Witch (2015) and Midsommar (2019) sparked renewed interest in folk horror. Southeast Asian cinema also commonly features folk horror.

Lamb is a 2021 folk horror film directed by Valdimar Jóhannsson, who also co-wrote the screenplay with Sjón. The film's plot is about the birth of a human/sheep hybrid of mysterious origin and the couple who adopts the child as their own. An international co-production between Iceland, Sweden, and Poland, the film stars Noomi Rapace, and marks Valdimar's feature-length directorial debut. Rapace and Béla Tarr were executive producers. After premiering at the 2021 Cannes Film Festival, the film was released in Iceland on 24 September 2021. It was selected as the Icelandic entry for the Best International Feature Film at the 94th Academy Awards.