Blue Mint Bush (Ziziphora clinopodioides) belongs to the family Lamiaceae and grows in Iran, Iraq, Central and Eastern part of Turkey. The leaves of Ziziphora clinopodioides L. samples were collected on the beginning of July (2010) from Kocko-pru area (Van Province, Turkey) at an altitude of 1924 m and described accordingly. Hydrodistillation was used to isolate the essential oil of the plant and then 33 constituents were identified by using GC-MS. The majority presented compounds of the essential oil were Pulegone (29.31%), Menthone (21.79%), 1,8-Cineole (15.31%), beta-Pinene (8.74%), Limonene (3.91%), alpha-Pinene (3.17%), 3-Terpinolenone (3.09%), beta-Phellandrene (2.88%), respectively. Menthofurane, Isopulegone and Germacrene D are represented by low concentrations. A cluster analysis was carried on the essential oil composition of Z. clinopodioides to identify homogenous groups.