The present invention relates to the cosmetic use, as deodorant active agent, of an essential oil of Satureja montana comprising more than 60% by weight of geraniol and more than 5% by weight of trans-β-caryophyllene, in particular of Satureja montana L. ssp. variegata (or Satureja Montana var. citrodoria oil). It also relates to a cosmetic method for treating human body odours, in particular of the armpits or feet, which consists in applying, to human keratin materials, at least one Satureja montana essential oil as defined previously or a composition containing same in a cosmetically acceptable medium.