Conventionally,　Pd　catalysis　has　been　widely　used　in　either　heterogeneous　or　homogeneous　thermocatalytic　organic　synthesis.　Herein,　we　demonstrate　a　case　study　on　the　important,　cocatalyst　role　of　Pd　nanoparticles　in　ternary　In2S3-(reduced　graphene　oxide-palladium)　[In2S3-(RGO-Pd)]　composites　for　the　selective　oxidation　of　alcohols　under　visible-light　irradiation.　Pd　acts　as　dual　cocatalyst　along　with　RGO　to　promote　the　more　efficient　separation　of　photogenerated　electron-hole　pairs　and　facilitate　their　spatial　transfer　across　the　interface　in　ternary　In2S3-(RGO-Pd)　composites,　which　leads　to　higher　activity　than　that　of　binary　In2S3-RGO　composites.　This　work　highlights　the　promising　scope　of　using　Pd　nanoparticles　as　a　cocatalyst　for　promoting　visible-light　photocatalysis　towards　selective　organic　transformations　under　ambient　conditions.　©　2015　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim.