A commercial activated carbon, Industrial React FE01606A, without impregnation of any metal, was used as a catalyst in the wet oxidation of three dyes commonly found in textile wastewaters, Orange G, Methylene Blue, and Brilliant Green. Runs were carried out in a three phase fixed-bed reactor by feeding concurrently an aqueous phase containing 1000 mg/L of the dye and an oxygen gas flow rate of 90 mL/min. Temperature was set to 160 degrees C, and the pressure in the reactor was fixed to 16 bar. The catalyst showed high catalytic activity in dye conversion and color removal. The catalyst kept stable during the time tested on stream (200 h). Total decolorization is obtained at short residence times, but some refractory organic intermediates are obtained (mineralization achieved an asymptotic value about 40-60% depending on the dye). The toxicity of the inlet and outlet effluent was measured by the Microtox bioassay, and the oxidation intermediates identified and quantified explained the obtained toxicity evolution.