Abstract The constituents of the essential oil obtained by hydrodistillation of Stachys schtschegleevii Sosn. (Lamiaceae) grown wild in Iran were investigated by GC and GC/MS. Forty-two components (representing 99.3% of the total oil) were identified. The major components were α-pinene (27.4%), β-phellandrene (14.7%), germacrene D (14.1%), β-pinene (10.5%), and α-phellandrene (4.7%).