We used GC/MS to determine the chemical composition of the essential oils of wild Achillea plants native to Yugoslavia: Achillea millefolium L. ssp. pannonica (Scheele) Hayak, A. crithmifolta W. et K., A. serbica Nym. and A. tanacetifolia All. Seventy-four components were identified. All four oils contained camphor (416%), l,8-cineole (623%) and bomeol (416%). In addition, artemisia ketone (4%) was found in A. crithmifolta, alpha-thujone (4.5%) in Achillea millefolium, yomogi alcohol and 2-pyrolidone were specific to A. serbica, and A. crithmifolia contained cis-chrysanthenol(l.4%) and large amounts of the corresponding acetate (23.4%).