The essential oil obtained by hydrodistillation of the leaves and twigs of Prostanthera staurophylla (Lamiaceae) native to the NSW New England Tablelands was investigated by GUMS, NMR and FTIR. The shrub yielded 2.1% (fresh weight) of an oil rich in terpenoids including the rare α-phellandren-8-ol (5.7%). Other significant contributors to the mint-like aroma of the oil were found to be limonene (26.9%), α-pinene (10.7%), verbenone (8.4%), camphor (3.9%), and chrysanthenone (2.1%).