Abstract Sideritis raeseri ssp. attica, which grows in rock crevices, is an endemic that occurs on mountains of Sterea Ellas (Greece). The essential oil produced in 0.17% yield from the aerial parts of S. raeseri ssp. attica was analyzed by GC/MS. The major constituents were α-pinene (28.7%) and β-pinene (27.2%). Key Word Index: Sideritis raeseri ssp. attica Labiataeessential oil compositionα-pineneβ-pinene