Abstract The essential oils from leaves and fruits of Siparuna guianensis collected in southeastern Brazilian cerrado were analyzed by GC and GC/MS. The main constituents found in the leaf oil were decanoic acid (46.6%) and 2-undecanone (31.7%). The fruit oil consisted mainly of 2-undecanone (32.5%), Î²-pinene (19.6%) and limonene (13.6%).