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This study aims to determine the effect of annealing temperature on the barium titanate (BaTiO3) films as a solar cell material. The synthesis of BaTiO3 uses barium hydroxide (Ba(OH)2) and titanium dioxide (TiO2) as the base material. The results of the deposition of BaTiO3 films were annealed with temperature variations of 400oC, 500oC, and 600oC with a holding time of 1 hour respectively. Characterization was carried out using X-Ray Diffraction (XRD) to determine the microstructure of the films, test the optical properties of the films with UV-Visible and Fourier Transform Infrared Spectroscopy (FTIR) to analyze chemical bonds between molecules and particle size was calculated using the Scherrer formula. The analysis showed a decrease in the energy gap and absorption for the higher annealing temperature. Variations in annealing temperature cause changes in microstructure, crystal size, and the degree of crystallinity that affect the energy gap and the absorption of BaTiO3 films.