The elimination of dyes via photocatalysis is a promising approach for achieving pollution-free environments. ZnO, WO3, and ZnO - WO3 (in a 1 : 1 weight percentage ratio) were synthesized through a green synthesis method. The resulting products were characterized using X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and diffuse reflectance spectroscopy (DRS). The XRD pattern indicate the formation of crystal structures of ZnO, WO3 and ZnO - WO3. Optical studies revealed that the optical band gaps for pure ZnO, pure WO3, and the ZnO-WO3 photocatalysts were 4.20 eV, 3.03 eV, and 3.29 eV, respectively. The photocatalytic activity of the synthesized samples was evaluated through the degradation of methyl orange (MO). The obtained results demonstrated that the synergistic effect between WO3 and ZnO contributes to enhanced the charge separation and a reduction in the recombination rates of charge carriers, thereby significantly improving photocatalytic performance. It was observed that 100 % degradation of the MO dye can be achived by the ZnO / WO3 composite after 15 minutes of visible light irradiation.