Abstract: The essential oils of flower and leaves of Dorystoechas hastata Boiss & Helder. ex Bentham, grown in Turkey, was obtained by hydrodistillation and analysed by GC and GS-MS. Fourty components were identified in the flowers oil, which represented about 93.97% of the total composition of the oil. The major constituents of the flower essential oil were myrcene (19.37%), 1,8-cineole (14.30%), β-pinene (9.19%), α-pinene (8.49%) and β-caryophyllene (6.18%). Thirty-seven components were established in the leaves oil, making up 97.16% of the total composition. The main constituents of the essential oil of the leaves were myrcene (20.71%), 1,8-cineole (18.76%), β-pinene (12.51%), α-pinene (8.54%), bornyl acetate (7.28%) and terpinene-4-ol (6.19%). As seen, myrcere, 1,8-cineole and β-pinene for both oils were the main components.