Essential oil from the pericarp of the fruit of Zanthoxylum armatum DC. (syn. Z. alatum Roxb.), which grows wild in the U.P. hills was examined by GC and GC/MS. The oil (10–12%) was found to contain 25 constituents which represent 99.6% of the total oil. The major constituents were linalool (72%), methyl cinnamate (12.2%), limonene (6.2%) and β-phellandrene (5.3%).