The essential oils obtained from different parts of Schinus terebinthifolius Raddi. were analysed by GLC and GLC-MS. A total of 53 compounds were identified: 40 of which were reported for the first time in this plant. Qualitative and quantitative differences of different oils have been recorded. In the fruits and stem bark oils, α-pinene was the major compound constituting 27.5% and 52.4%, respectively. The major compound of both flower and leaf oils was a-cadino! and represented by 14.8% and16.8% respectively In the wood oil. α-cadinene (27.5%) was the major constituent. All the prepared oils showed remarkable antimicrobial and antifungal effects.