The wild herb Thymus vulgaris Lamiaceae was collected from Barzo region of Shirvan, North Khorasan Province of Iran. GC-MS studies on the obtained essential oil of the powder of aerial parts of this plant showed 36 compounds. These compounds were representing of more than 96 % of the essential oil which were identified on account of their mass spectra and retention index (RI) values. Some of the major components of the oil were thymol (45.4 %), o-cymene (13.4 %), γ-terpinene (6.9 %), borneol (6.6 %), 4terpineol (2.9 %) and isoborneol (4.2 %).