Abstract A patchouli oil from Indonesia was analyzed qualitatively and quantitatively by GC (FID) and GC/MS. Using different ionization techniques in mass spectrometry (EI, NCI and PCI with ammonia and deuterated ammonia as reagent gases), 41 compounds were separated, 28 of which (92.9% of the total oil) were identified. Four new compounds were found in this oil: Î³-gurjunene (2.2%), germacrene D (0.2%), aciphyllene (3.4%) and 7-epi-Î±- selinene (0.2%).