The heating process affects the quality of both VOO and ROO. Looking at the oxidative state of the oils after heating, ROO is affected more with respect to the formation of free fatty acids, dienes and trienes. The peroxide value was notable because in ROO, it increased 10 times the increase in PV of VOO. During heating the content of unsaturated fatty acids decreased to a greater extent in ROO than in VOO. This result was in good agreement with the corresponding iodine value. The results show a higher oxidative stability of VOO in contrast to that of ROO during heating. The higher content of active antioxidant compounds such as tocopherols in VOO may protect the oil against oxidative deterioration. Future work must be conducted on the determination of the time duration and intensity of the heating process that would produce a lesser effect on the quality of the olive oil