The purpose of this investigation was to characterize the effect of ozone upon a selected textile dyeing and finishing wastewater, with primary emphasis placed on noting the effect of ozone on the color of the wastewater. The parameters measured during the study included color, chemical and five-day biochemical oxygen demand, pH, dissolved oxygen, total organic carbon, ozone residual, total and suspended solids, and turbidity. The results of the investigation showed that color was removed to a significant degree from the selected wastewater by the action of ozone. Up to 80 percent of the original color of the wastewater was removed by ozonation. COD removals ranging from 20 to 30 percent were also measured. In addition, significant increases in the amounts of suspended solids and turbidity were noted to occur with increased ozonation. / Master of Science