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The essential oil of Otostegia persica flowers and leaves from Sistan and Baluchestan (OSB) and top flowering aerial parts from Kerman (OK) Provinces were prepared by hydrodistillation, with a yield of 0.08, 0.1, and 0.15% v/w, respectively. The essential oils were analysed by GC and GC/MS. Seventeen compounds were recognized from the OK essential oil sample (92.06%) and it was rich in non-terpenes. The major compounds were α-copaene-8-ol (5.93%), hexadecanoic acid methyl ester (4.76%), hexadecanoic acid (31.73%) and pentacosane (29.51%). From the flower and leaf oils of OSB, 33 and 26 compounds were characterised, which represented 90.29% and 83.27% of the oils, respectively. α-Pinene (13.62%), linalool (6.76%), verbenol (9.22%), trans-carveol (4.00%), pentadecane (4.56%), caryophyllene oxide (4.84%) and hexadecane (5.52%) were the major compounds of the flower, while α-pinene (4.48%), verbenol (10.16%), trans-anethole (4.47%), geranyl acetone (6.47%), pentadecane (5.94%), hexadecane (5.86%) and hexahydrofarnesyl acetone (14.34%) were the dominant components of leaves. The antioxidant activities of the essential oils were measured using a free radical scavenging method with 2-2-diphenyl 1-picrylhydrazyl (DPPH). The IC50 of the OSB essential oil was more potent (9.76±1.1) than natural and synthetic antioxidants like vitamin E (12.02±1.8) and BHA (24.16±2.2).