The maquis is widely distributed across areas in Turkey where the Mediterranean climate predominates as well as the Mediterranean basin and Europe. Maquis vegetation, which harbors many different species of plants, spreads horizontally and vertically over large areas mainly in the Mediterranean Region of Turkey and forms important ecosystem within Turkey. This study investigated within the same habitat (Isparta-Turkey) shows the carbon (C), nitrogen (N) and C/ N ratios in the leaves, branches and stems of 19 different plant species (1Laurus nobilis L., 2-Tamarix parviflora DC., 3-Cercis siliquastrum L., 4-Olea europaea L., 5-Rhus coriaria L., 6-Paliurus spina-christi Mill., 7-Vitex agnus-castus L., 8-Phillyrea latifolia L., 9-Pistacia terebinthus L., 10-Quercus coccifera L., 11-Fontanesia phillyreoides L., 12-Cistus creticus L., 13-Nerium oleander L., 14-Myrtus communis L., 15-Arbutus andrachne L., 16-Crataegus monogyna Jacq., 17-Styrax officinalis L., 18-Cotinus coggygria Scop. and 19-Juniperus oxycedrus L.) with significant distribution in the maquis shrublands of the Mediterranean Region of Turkey. In general, the carbon and nitrogen ratios of different plant species demonstrated significant differences.