From the point of view of its biodiversity, the Iberian Peninsula is one of the most interesting areas. Its special geographical location and geological history have created a high degree of diversity within the invertebrates groups in general, and within the ecological group of the Turbellaria in particular. In the present work, old and new records of turbellarian species from the central areas of the Iberian Peninsula are presented. Data on their biology and distribution within the freshwater habitats, mainly limnic, are also provided. This study is mainly based on the project Fauna Iberica III.