The Trap Door is a British animated television series, originally shown in the United Kingdom in 1986. The plot revolves around the daily lives and the misadventures of a group of monsters living in a castle. These include a blue creature called Berk, a spider-like creature called Drutt and Boni who was a skull of unknown origin. Although the emphasis was on humour and the show was marketed as a children's programme, it drew much from horror and dark fantasy.

The show has since become a cult favourite and remains one of the most widely recognised British children's shows of the 1980s.