Essential oil components of the aerial parts of Thymelea microphyla Coss et Dur. have been studied by gas chromatography-mass spectrometry to afford 11 components. The major components were found to be: D-menthone (41.86 %), 2-Undecanone (23.74 %), Pulegone(11.94%) and Perillal (9.34 %). Some other compounds were only present in minor amounts. In total, volatile oil composition of Thymelea microphyla Coss et Dur. was considered as a rich source of oxygenated monoterpenes .