Abstract The essential oils from twigs and seeds of Pituranthos scoparius (Coss et Dur.) Benth. et Hook. (Umbelliferae) obtained by hydrodistillation, were analyzed by GC/MS. From the two oils, 150 and 50 mass spectra were recorded, respectively. Approximately, 94 compounds were identified including 34 hydrocarbons (4 aromatic, 12 monoterpene, 18 sesquiterpene), 2 oxides, 8 aldehydes, 10 ketones, 24 alcohols, 9 phenolic derivatives and 7 miscellaneous compounds. Numerous additional compounds, mainly sesquiterpenoids, remain unidentified. The twig oil contained Î±-pinene (34%) and apiole (15%) as the two principal components. The major constituents in the seed oil were apiole (52%), bornyl acetate (21%) and Î±-pinene (11%).