Abstract The essential oil of Acorus calamus L. roots obtained from Konya (Beysehir) was analyzed by GC/MS. Forty-three components representing 71.16% of the oil were identified. Preisocalamendiol (17.3%), isoshyobunone (13.0%), 1,4-(trans)-1,7(trans)-acorenone (10.5%), camphor (5.9%), 2,6-diepishyobunone (2.6 %) and Î²-gurjunene (2.5%) were the major constituents.