In this study, biodiesel production from the hazelnut (Corylus avellana L.) kernel oil, sunflower (H. annuus L.) oil and hybrid {hazelnut and sunflower (50:50 v/v)} feedstocks were carried out in the laboratory scale reactor. The reaction time of 2 h at 60 °C and stirring 200 rpm. The reaction was carried out using 100% excess
methanol, i.e. molar ratio of methanol to oil is 6:1 and catalyst concentration of 0.7%.By Potassium hydroxide (KOH) was used as catalyst