The photocatalytic degradation of leather dye, Acid green 16 was studied in aqueous solution in the presence of ZnO catalyst by solar oxidation process. The effects of various parameters like concentration of dye, amount of catalyst, irradiation time and pH on the efficiency of decolourisation and degradation were studied. The degradation of Acid green 16 and organic intermediates was found to be more effective in alkaline pH range. The decolourisation and degradation were followed by UV Visible spectrophotometric and COD methods respectively. It is suggested that photocatalytic degradation will be a useful technique for the removal of dye in wastewater from leather industries.