Four essential oils (EOs), rarely described in the literature, and never for samples originating from Reunion Island, were studied by gas chromatography with flame ionisation detector (GC-FID) and gas chromatography coupled with mass spectrometry and olfactometry (GC/MS-O). The chemical composition, as well as the main olfactory properties, of the following four EOs were determined: longose (Hedychium gardnerianum), yellow ginger (Hedychium flavescens), bois de joli coeur (Pittosporum senacia), and Chinese guava (Psidium cattleianum). The chemical compositions were found to be rich in mono-and sesquiterpene hydrocarbons. The main components of H. gardnerianum flowers EO was β-farnesene (12.1%), α-cadinol (9.7%) and α-farnesene (7.1%). The composition of essential oil from Hedychium flavescens leaves is reported for the first time with β-and α-pinene (47.8 and 18.7%, respectively) as well as β-caryophyllene (17.5%) as the main compounds. The main components of P. senacia leaves EO and P. cattleianum floral tops EO was identified as nonane (36.2%) and β-caryophyllene (43.7%), respectively. With such a chemical composition, herbal, citrus, green, pine tree, and in some cases floral and woody odors were determined by GC/MS-O.