Abstarct: In this thesis, gliding arc plasma and DBD plasma were used for surface treatment of natural leather to increase hydrophilicity. Gliding arc plasma and DBD plasma work at atmospheric pressure and they do not require expensive vacuum equipment and also have the possibility of continuous and uniform surface treatment. Samples were treated with air plasma and water vapor plasma. The surface properties of the treated leathers were determined by scanning electron microscopy. Surface hydrophilicity was analyzed by water contact angle, absorption time and absorption capacity. The contact angle results showed that after treatment, the contact angle of the samples decreased and the leather surface became hydrophilic. The effect of plasma treatment on mechanical properties of leather was investigated by using tensile strength measurement method. The results show that plasma technology can meet the needs of the leather industry, including high capability, technical simplicity and required economy.