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The essential oil compositions of Rosmarinus officinalis L. leaves growing in Mersin, Turkey Binzet, Gun Binzet, Riza Arslan, Hakan GC-MS Mersin 1 8-Cineole Essential oil Hydro-distilation Rosmarinus officinalis This study reports on the chemical compositions of the essential oil of Rosmarinus officinalis L. (Rosemary) grown in Mersin, Turkey. The essential oil of rosemary was obtained by hydrodistillation method, and the yield of rosemary oil was found to be about 1.2 % (v:w). The hydrodistilled volatile oil was analyzed by gas chromatography and mass spectrometry techniques. Forty-five components were identified in the essential oil of R. officinalis, which represented 100% of the total essential oils. The oxygenated monoterpenes content possessed the highest value, 64.78% of the oil, among which eucalyptol (33.15%) and camphor (10.31%) were the most abundant components. In addition, the oil contained mainly monoterpene hydrocarbons, sesquiterpene hydrocarbons, oxygenated sesquiterpenes, and diterpenes. The least amount of diterpenes were found in the content of the oil. Isopimara-9 (11),15-diene (0.14%) and α-springene (0.06%) were two compounds determined as diterpene compounds. Atlanta Publishing House LLC 2020-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/2048 10.5155/eurjchem.11.4.370-376.2048 European Journal of Chemistry; Vol. 11 No. 4 (2020): December 2020; 370-376 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/2048/pdf_2048 Copyright (c) 2020 Authors