The essential oil of four salvia species was studied by means of GC-MS analysis. Total of 25 compounds were identified: 11 compounds were for S. syriaca with total oil of 90.98%; 7 compounds were for S. aristata with total oil of 98.23%; 11 compounds were for S. atropatana with total oil of 72.04%; 3 compounds were for S. nemorosa with total oil of 88.53%. The invitro antioxidant activities of the essential oil of four salvia species were examined. S. atropatana had the most antioxidant activity (42%). It was followed by S. aristata (31%), S.syriaca (24%) and S. nemorosa (21%).