this study reports the chemical composition of the essential oil of nashia inaguensis millsp. organically cultivated in french guiana. this essential oil was examined by a combination of gc/fid and gc-ms techniques. a total of thirty-one components accounting for 97% of the total gc/fid chromatogram were identified. the most abundant ones were carvacrol (23.1%), p-cymene (18.7%), -terpinene (14.6%), thymol methyl ether (10.3%), thymol (8.3%), trans--caryophyllene (8.0%) and myrcene (2.3%). the essential oil of n.inaguensis was tested for the first time for antifungal and antiparasitic activities against strains of several candida spp. and leishmania guyanensis respectively: the strong antimicrobial activity of this essential oil was confirmed in vitro by the definition of mic values ranging from 125 g/ml to 500 g/ml according to the candida species tested, while the anti-leishmania activity assessed by the definition of an ic50 value seem negligible.