 This study investigated the effects of varying concentrations of tetrabutyl orthotinate, Tbote, diethanolamine, DEA, and temperature on the optical properties of TiO2 thin films. The results showed that increasing the concentration of Tbote and DEA resulted in higher transmittance values, while increasing the temperature increased the absorbance values. Additionally, the direct and indirect band gaps were found to be 3.38 EV and 3.25 EV respectively, which are close to or within the standard band gap range of TiO2, 3.2 EV, 3.35 EV. This article was authored by Majid al-Hakmathan, Abu Sayyid and M.T.s Rahman.