The volatile oil constituents of cultivated Petroselinum hortense Hoffm. fruits from Northwest Iran were identified and quantified by GC/EI-MS. Twenty-eight components were identified, comprising 98.7% of total oil. Phenylpropanoids (70.7%) were the main group of volatile oil components, followed by monoterpene hydrocarbons (26.1%). Oxygenated monoterpenes (1.5%) and sesquiterpenes (0.4%) had a minor part in the essential oil profile. Myristicine (43.1%), apiole (13.9%), alpha-pinene (11.5%), beta-pinene (9.6%), elemicine (7.6%) and allyltetramethoxy benzene (6.1%) were the main components of essential oil. Sabinene has been determined in appreciable amounts (2.8%). In total, the volatile oil of P. hortense fruits studied in the present experiment was characterized as a volatile oil rich in phenylpropanoid derivatives along with substantial amounts of alpha-pinene and beta-pinene, which may be used as a possible source of these highly valued volatile oil compounds in pharmaceutical, food and fragrance industries.