Abstract The essential oils of Hyssopus officinalis L. var. decumbens (HOD) from France (Banon) and H. officinalis (HO) from Italy (Piedmont) were studied by GC and GC/MS. The bicyclic monoterpene ketones, pinocamphone and isopinocamphone, were present in HO (4.4% and 43.3%, respectively, in accordance with the ISO 9841 Standard, 1991 E), but their percentages were very low in HOD, where instead linalool (49.6%), 1,8-cineole (13.3%) and limonene (5.4%) were predominant. Key Word Index: Hyssopus officinalis Hyssopus officinalis var. decumbens Lamiaceaeessential oil compositionpinocamphoneisopinocamphonelinalool1,8-cineolelimonene