Abstract The essential oil obtained by hydrodistillation of the aerial parts of Ferulago angulata (Schlecht.) Boiss. (Umbelliferae), growing wild in Khorasan province in Iran, were analyzed by GC and GC-MS. Twenty compounds representing 98.1 % of the aerial parts oil of Ferulago angulata were identified, of which ot-phellandrene (24.2 %), Ã-phellandrene (14.9 %), ot-pinene (14.7 %) and p-cymene (10.3 %) were the major ones, other major component of the oil were ô-3-carene (6.7 %) and (Z)-Ã-ocimene (5.8 %). Aerial parts oil of the plant consist of monoterpenes (97.6 %) and one oxygen containing sesquiterpene (0.5 %). Monoterpene hydrocarbons (90.8 %) were the major constituents. Key words: Ferulago angulataessential oilGC-MSot-phellandrene