Herein,　we　have　examined　the　effect　of　tungsten　trioxide　(WO3)　doping　in　graphitic　carbon　nitride　(g-C3N4)　photocatalysts　towards　photodegradation　of　organic　pollutant　in　aqueous　medium.　A　sequence　of　visible　light　driven　WO3/g-C3N4　composites　were　synthesized　at　various　mole　ratios　(1,　2,　3　and　5%)　of　WO3　into　g-C3N4　via　simple　and　short-time　wet-impregnation　method.　The　fabricated　photocatalytic　materials　were　investigated　by　X-ray　diffraction　(XRD),　Fourier　transform-infrared　(FT-IR)　spectroscopy,　UV–vis　diffuse　reflection　spectroscopy　(DRS),　photoluminescence　(PL)　and　scanning　electron　microscopy　(SEM).　The　photocatalytic　performance　of　the　fabricated　photocatalysts　were　assessed　by　the　degradation　of　acid　orange　7　(AO7)　in　visible-light　illumination.　The　WO3/g-C3N4　composites　were　found　to　be　exhibit　an　improved　visible-light　induced　photocatalytic　performances　compared　to　the　pure　WO3　and　g-C3N4.　However,　among　the　different　composites,　the　optimized　3　wt%　WO3/g-C3N4　composite　has　shown　complete　(100%)　degradation　efficiency　of　AO7　after　75　min　which　is　superior　than　the　pure　g-C3N4.　This　synergistic　enhancement　might　be　credited　to　its　increased　light　absorption　in　visible-light　region　and　the　photoexcited　electron　transfer　from　g-C3N4　to　WO3　catalyst　surface　and　enhanced　charge　separation　efficiency.　Additionally,　the　photo-electrochemical　measurements　of　3　wt%　WO3/g-C3N4　composite　has　exhibited　a　quicker　migration　of　the　photo-excited　charge-carriers.　The　radical　scavenging　studies　inferred　that　the　O2[rad]−　are　the　key　species　accountable　for　the　degradation　of　AO7　for　fabricated　WO3/g-C3N4　composite　materials.　Hence,　the　higher　photocatalytic　activity,　long-term　stability　and　recyclability　of　WO3/g-C3N4　composite　has　displayed　it　is　a　auspicious　material　for　the　photocatlytic　degradation　of　organic　contaminant　applications.　©　2020