Pectin and essential oils (EOs) were simultanuously extracted from pomelo peels by adding citric acid into water used for hydrodistillation of pomelo peels. The effect of citric acid concentrations (0–0.55%) on the chemical composition and yield of EOs and pectin yield were investigated. EO yields and the chemical compostion were not significantly affected by citric acid. EO yields were about 1% fresh weight or 4.6% dry weight at all tested concentrations of citric acid. Total monoterpene hydrocarbon content of essential oils in all treatments was not significantly different and within narrow range of 93–94.71%, in which limonene, a main component of pomelo EOs, fluctuated around 89%. However, pomelo pectin yield increased with citric acid concentration. It varied from 11 to 24% as citric acid concentration rose from 0 to 0.55% (equivalent to pH from 7.3 to 2.1). In short, hydrodistillation using citric acid solution is a feasible processing method that combines two different extraction processes into one.