Abstract The composition of the essential oil of Thymus daenensis Celak. ssp. lancifolius (Celak.) Jalas was analyzed by means of capillary GC and GC/MS. The oil contained over 43 compounds. The major components were thymol (73.9%), carvacrol (6.7%), p-cymene (4.6%), Î²-bisabolene (1.5%) and terpinen-4-ol (1.4%).