Abstract The essential oils isolated by hydrodistillation from the leaves of six Eucalyptus were analyzed by GC and GC/M S. The main components identified in E. intertexta R.T.Baker oil were 1,8-cineole (64.8%), terpinen-1-ol (7.2%) and α-pinene (5.7%); in E. largiflorens F.Muell. were 1,8-cineole (47%), p-cymene (10.6%) and α-terpineol (8.5%); in E. kingsmillii Maiden et Blakely were 1,8-cineole (77%), α-pinene (8.7%) and camphene (3.8%); in E. dealbata A. Cunn. were 1,8-cineole (70.6%), α-pinene (13%) and terpinen-1-ol (3.7%). The major components of the oil of E. loxophleba Benth. ssp. loxophleba were 1,8-cineole (41.9%), α-pinene (13.7%) and aromadendrene (3.7%), and the major components of E. kruseana F.Muell. were bicyclogermacrene (28.8%), α-pinene (17.7%) and 1,8-cineole (12.1%).