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ZnWO₄ nanoparticles on reduced graphene oxide (ZnWO₄-NPs@rGO) nanocomposites were synthesized using the hydrothermal method. Structural, morphological, optical, and photocatalytic studies of the ZnWO₄-NPs@rGO nanocomposites were successfully investigated. Photo-catalytic performances of the ZnWO₄-NPs@rGO nanocomposites were examined for the degradation of hazardous methylene blue dye (HMBD) in a neutral medium. ZnWO₄-NPs@rGO nanocomposites show superior photo-catalytic performances over pure ZnWO₄ nanoparticles. ZnWO₄-NPs@rGO nanocomposites degrade ~98% dye while pure ZnWO₄ nanoparticles degrade ~53% dye in 120 min. The prepared nanocomposites also show excellent recycled photo-catalytic efficiencies over multiple cycles.