Abstract A steam distilled oil obtained from the aerial parts of Artemisia barrelieri Besser grown in Spain was analyzed by GC and GC/MS. The oil contained 1,8-cineole (30.0%) and chrysanthenone (24.3%) as major constituents. Other important components were filifolone (6.3%), Î±-thujone (5.1%) and camphor (4.4%). Key Word Index: Artemisia barrelieri Asteraceaeessential oil composition1,8-cineolechrysanthenone