Purpose of this project was extraction of high purity naphthalene from fuel oils produced in Iranian petrochemical complexes. Fuel oils with considerable amount of naphthalene are low value by products of olefin units in petrochemical complexes. These, are known as cracked fuel oil (CFO), has naphthalene content of 13-31%. In this project CFO of Arak and Tabriz petrochemical complexes were used as feed for our experimental work. These CFO’s have high boiling point and are mostly consisted of aromatic components and naphthalene is one of the volatile aromatic components among them. In this work the feed was initially distilled by using direct steam and due to reduction of boiling point temperature volatile components including naphthalene were separated without sublimation. Since aromatic components have negligible solubility in water the product of this stage was easily divided into two separate aqueous and organic phases. Naphthalene in the separated organic phase was extracted by methanol to gain a high purity product. Methanol as solvent can dissolve naphthalene whereas other impurities in the organic phase produced in the first stage are mostly insoluble in methanol. Extracted naphthalene was separated from methanol by adding sufficient amount of water to the solution. Water and methanol mixture make no azeotrope and therefore can be easily separated to its components by simple distillation. This fact gives the opportunity of reusing methanol. In the defined conditions of the experiments 90-96 percent of naphthalene in the initial feed was extracted with the purity of 96-99 weight percent for naphthalene.