In this study, scorpion fauna of Arborz province (Northwestern of Iran) was investigated which has not previously studied in detail. Total of 139 scorpion specimens have been collected as a result of the field studies in 2015. and Androctonus crassicauda (Olivier, 1807), Odontobuthus doriae (Thorell, 1876), Mesobuthus eupeus eupeus (C. L. Koch, 1839), Orthochirus scrobiculosus (Grube, 1873) and Scorpio maurus Linnaeus, 1758 taxa were identified. Identified all species were detected from Arborz province for the first time