Natural sources used as folk medicines in Merzifon were investigated in this study. It was determined that 35 plant and 4 animal species together with 3 animal and 1 inorganic sources are being used as various preparations of folk medicines in Merzifon area. All the collected medicinal plants were identified and voucher specimens were deposited in the Herbarium of Hacettepe University, Faculty of Pharmacy (HUEF).