Heterogeneous Fenton-like oxidation is an efficient method for dye decolorization, and the development of effective catalyst plays a crucial role in enhancing its performance. In this study, a novel magnetic catalyst (m-XG-Zeo) was synthesized from Fe₃O₄, xanthan gum, and zeolite for the decolorization of methyl violet 2B (MV-2B) and malachite green (MG). The catalyst was characterized using XRD, SEM, EDS, BET, FTIR, TGA, ICP-OES, and zeta potential analysis. The reaction parameters, including pH, hydrogen peroxide concentration, catalyst dosage, initial dye concentration, reaction time, temperature, and ionic strength were investigated. Kinetic studies were also performed. The results showed that MV-2B and MG decolorization efficiencies reached 83.4 % and 96.7 %, respectively, at 1 g/L m-XG-Zeo amount, 20 mg/L initial dye concentration, pH 6, 20 °C, 0.0236 M H