Terror is a 1978 British supernatural horror slasher film written by David McGillivray and directed by Norman J. Warren. It stars John Nolan and Carolyn Courage as two cousins who fall victim to a curse that a witch placed on their ancestors.

Conceived as a "fun horror film" with a simple premise, Terror was shot in various locations around London and Surrey. Although it was a box office success in the United Kingdom, it has drawn a mixed critical response for its storytelling and visual style, both of which were inspired by the Italian giallo horror film Suspiria (1977). Warren's plans for a sequel remain unrealised.