Abstract The chemical composition of the essential oils isolated by hydrodistillation from the flowers, leaves, stems and roots of Tithonia diversifolia have been studied by GC-MS. The identified components accounted for 96.7 %, 93.7 %, 88.9 %and 93.7 % of the flower, leaves, stems and roots oils, respectively. The major constituents of flowers, leaves, stems and roots oils were Î±-pinene (60.9 -75.7 %), Î´-pinene (7.2â11.0 %) and limonene (0.9â4.3 %).