Abstract The water-distilled essential oil from aerial parts of Thymus subcollinus was analyzed by GC and GC/MS. Thirty-four compounds were identified with germa-crene D (31.87%) and Î²-caryophyllene (17.56%) as major components. Key Word Index: Thymus subcollinus Labiataeessential oil compositiongermacrene DÎ²-caryophyllene