The effectiveness of wet oxidation (WO) of anthraquinone (Chem Brill Blue R) and phthalocyanine (Cibacron Turquoise Blue G) class reactive dyes in presence of copper catalyst has been studied in the temperature range of 140-175 degrees C and oxygen partial pressure of 0.345-1.380 MPa. The extent of COD and colour removal efficiencies have been measured and compared. COD reduction of more than 92% and almost 100% colour removal is observed during oxidation of these dyes. Copper sulphate (CuSO4) as a homogeneous catalyst is found to be very much effective in destruction of COD and colour of reactive dyes.