Abstract The essential oil of Phlomis cancellata Bunge (Labiatae) collected from the suburb of Nour, northern Iran, in July 2004, was isolated by hydrodistillation and analyzed by means of GC and GC/MS for the frst time. Fifty-three components were identifed in this oil. The major constituents of the essential oil were germacrene D (25.6%) and Î±-pinene (6.4%). Key Word Index: Phlomis cancellata Labiataeessential oil compositiongermacrene DÎ±-pinene