Öz This study is based on 145 rodent specimens collected from Kastamonu province during the summer in 1992 and 1993. Age determination of the specimens was done and only the adult specimens were evaluated. In the study area, 12 species which belongs to 10 genera; Sciurus anomalus, Cricetulus migratorius, Clethrionomys glareolus, Microtus arvalis, Spalax leucodon, Rattus rattus, Mus musculus, Apodemus mystacinus, Apodemus flavicollis, Apodemus sylvaticus, Dryomys nitedula and Allactaga euphratica were determined. Of these species Spalar leucodon, Apodemus flavicollis and Dryomys nitedula are the first records from the study area. Diagnostic characters, habitat, fur colour and measurements related to the species were recorded.