Unman, Wittering and Zigo is a 1971 British thriller film directed by John Mackenzie and starring David Hemmings, Douglas Wilmer and Tony Haygarth. It is adapted by Simon Raven from Giles Cooper's 1950s radio drama Unman, Wittering and Zigo. A new teacher arrives at a school and begins to suspect his predecessor was murdered by the pupils, though his suspicions are written off as paranoia. He sets out to prevent the same fate from befalling him.
The movie's title was parodied in Little Britain, and by Rowan Atkinson in a very well-received sketch for one of the early Secret Policeman's Ball concerts for Amnesty International
The film was set in Cornwall. Some outdoor scenes were filmed in Wales, but others and interior scenes were mostly filmed in the buildings of Reading Blue Coat School, Sonning, Berkshire, using some of its pupils as extras during the Summer vacation.