Research entitled hydrolysis of cellobiose using sulfated zirconia catalyst with a gallium oxide promoter has been carried out. Sulfated zirconia catalyst with a gallium oxide promoter was synthesized with various promoter content of 2% (GSZ-2), 5% (GSZ-5) and 10% (GSZ-10). The catalyst obtained was analyzed by XRD, GSA, SEM-EDS and solid acidity. Sulfated zirconia and sulfated zirconia with a …