Abstract The leaf oils of Eucalyptus microtheca F. Muell., Eucalyptus tereticornis Smith and Eucalyptus grandis W. Hill ex Maiden were analyzed by means of GC and GC/MS. The dominant compounds were 1, 8-cineole (53.8%) in E.microtheca, Î±-pinene (21.4% and 30.4%) in E. tereticornis and E. grandis, respectively, and Î²-pinene (39.4%) in E.tereticornis. The absence of 1,8-cineole in the oils of E. tereticornis and E.grandis is peculiar.