In this paper, the application of Iron(III) chloride and hydrogen peroxide oxidation processes for stabilized landfillleachate treatment was investigated. The leachate came from a municipal sanitary landfilland the average values of its main parameters were: pH 8,03; COD 605 gO₂/m³; BOD 65 gO₂/m³; NH₄⁺ 92 gN/m3; conductivity 6,47 mS/cm; UV254 absorbance 0,300 and turbidity 1,6 NTU. It is demonstrated that the application of Iron(III) chloride and hydrogen peroxide can effectively remove leachate pollutants such as color, COD and UV254 absorbance. A combination process, accomplished at different weight ratios of reagents H₂O₂/Fe was 1,7 to 32. The best conditions for process were found at a ratio Fe/COD equal to 0,9 and H₂O₂/Fe equal to 4,2. Leachates were significantlyoxidized under these conditions in terms of COD removal 72%, color removal 93% and UV254 absorbance removal 82,2%.