The Isle of Dread is an adventure for the Dungeons & Dragons role-playing game. The adventure, module code X1, was originally published in 1981. Written by David "Zeb" Cook and Tom Moldvay, it is among the most widely circulated of all Dungeons & Dragons adventures due to its inclusion as part of the D&D Expert Set. In the adventure, the player characters arrive on the Isle of Dread seeking a lost treasure, and there encounter new nonhuman races.

David "Zeb" Cook is an American game designer, best known for his work at TSR, Inc., where he was employed for over fifteen years. Cook designed several games, wrote the Expert Set for Dungeons & Dragons, worked as lead designer of the second edition of Advanced Dungeons & Dragons, and invented the Planescape setting for AD&D. He is a member of the Origins Hall of Fame.