The chemical composition of the volatile constituents from the leaves, stems, and roots of Acanthopanax sessiliforus growing wild in Mt. Deok-Yu was determined by GC and GC-MS spectrometric analysis with the aid of NBS, Wiley Library and RI indice searches. The major constituents identified were ${delta}-3-carene$ (7.24%), limonene (8.10%), ${eta}-thujene$ (17.85%), trans-bicyclic hydrocarbon (13.35%) and ${delta}-cadinene$ (4.28%) in the leaves from one year-grown plants, tricyclene (7.21%), ${eta}-myrcene$ (7.62%), limonene (10.23%), ${eta}-thujene$ (15.61%) and dihydroedulan I (6.12%) in the leaves from three years-grown plants, ${delta}-3-carene$ (4.96%), limonene (5.93%), ${eta}-phellandrene$ (17.31%) and naphthalene (7.79%) in the stems from one year-grown plants, ${alpha}-pinene$ (5.21%), limonene (5.12%) and ${eta}-phellandrene$ (9.82%) in the stems from three years-grown plants, ${alpha}-pinene$ (12.73%), ${eta}-pinene$ (11.16%), ${delta}-3-carene$ (6.16%) and ${gamma}-cadinene$ (23.39%) in the roots from one year-grown plants, and ${alpha}-pinene$ (17.25%), ${eta}-pinene$ (9.35%), ${delta}-3-carene$ (7.26%) and ${gamma}-cadinene$ (17.95%) in the roots from three years-grown plants.