This is a list of Registered Buildings and Conservation Areas of the Isle of Man. It includes buildings and structures in the Isle of Man designated by Isle of Man's Department of Environment, Food and Agriculture (DEFA) "as having special architectural or historical interest". Over 250 buildings and structures are listed, and 275 more have been identified as having potential for listing. It also lists the 21 Conservation Areas, historic districts" which protect "period"-type architecture, quality of building materials, relationships of enclosures and open spaces, and other aspects of the look and feel of historic buildings and areas.