S-doped TiO2 samples were synthesized by use of thiourea. The elemental analysis was confirmed by X-ray fluorescence, the phases were identified by X-ray diffraction and further characterization was carried out by surface area measurement and UV-Vis spectroscopy. The photocatalytic activity was measured by exposing methylene blue to sunlight in the presence of TiO2. It was observed that the S-doped anatase phase showed high photocatalytic activity in comparison to other samples.