Folkestone Warren is a 316.3-hectare (782-acre) biological and geological Site of Special Scientific Interest (SSSI) which runs along the coast between Folkestone and Dover in Kent. It is a Nature Conservation Review site and it contains three Geological Conservation Review sites and part of a fourth. An area of 83.6 hectares (207 acres) is a Local Nature Reserve,

These chalk cliffs have several nationally rare plants and they provide a location for cliff nesting and wintering birds. The SSSI also contains two internationally important reference sites for study of the Cretaceous period.