Abstract The essential oil of Rabdosia melissoides produced from plants harvested at their post-flowering stage was analyzed by GC and GC/MS. Thirty-three constituents comprising about 96% of the oil have been identified. Besides thymol (26.9%), p-cymene (16.5%) and carvacrol (6.8%) other major constituents identified were menthol (14.2%), piperitone (8.9%) and methyl thymol (6.3%).