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Essential oils from the leaves, aerial stems, basal stems, and rhizomes of Etlingera fimbriobracteata (K.Schum.) R.M.Sm. were analyzed using a gas chromatography-flame ionization detector (GC-FID) and by gas chromatography-mass spectrometry (GC–MS). β-Pinene (67.8%) and 1,8-cineole (37.2%) were the main components of the oils from leaves and aerial stems, respectively, whereas decanal was the main component of basal stems and rhizomes (27.5% and 34.4%, respectively). The antioxidant activities of the oils were evaluated using several in vitro assays; the 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) free radical scavenging assays, the reducing power ability (RPA) assay, and the ferric reducing antioxidant power (FRAP) assay. In all the tests, essential oils from different plant parts showed very poor antioxidant activity compared with those …