Abstract: This paper presents experimental results concerning the effect of dielectric type on ozone concentration and the efficiency of its generation in plasma reactor with two mesh electrodes. Three types of dielectric solid were used in the study; glass, micanite and Kapton insulating foil. The experiments were conducted for voltage ranges from 2.3 to 13 kV. A plasma reactor equipped with two 0.3×0.3 mm² mesh electrodes made of acid resistant AISI 304 mesh was used in the experiments. The influence of the dielectric type on the concentration and efficiency of ozone generation was described. The resulting maximum concentration of the ozone was about 2.70–9.30 g O₃ m⁻³, depending on the dielectrics used. The difference between the maximum and the minimum ozone concentration depends on the dielectric used, this accounts for 70% at the variance. The reactor capacity has also been described in the paper; total C_t and dielectric capacitance C_d depending on the dielectric used and its thickness.