Plasmon-induced　hot　electrons　offer　unique　advantages　in　solar-light-driven　chemical　reactions.　Noble　metal　nanostructures　have　been　the　most　studied　plasmonic　materials,　but　the　hot　electron　lifetime　is　extremely　short.　Here,　we　have　discovered　extraordinarily　long-lived　hot　electrons　in　degenerately　doped　molybdenum　oxides　with　surface　plasmon　resonance　in　the　visible　and　near-infrared　region.　Their　lifetime　is　nanosecond-scale,　which　is　enhanced　by　4　orders　of　magnitude　compared　to　their　noble　metal　counterparts.　Such　a　property　is　ascribed　to　the　quasi-metallic　feature　of　molybdenum　oxides　driven　by　hydrogen　dopant-induced　bandgap　trap　states,　in　which　the　electron-phonon　scattering　is　dominant　over　the　ultrafast　electron-electron　scattering　in　the　decay　dynamics　of　hot　electrons.　The　plasmonic　dye　oxidation　and　hydrogen　evolution　are　explored　without　the　coupling　of　semiconductors,　providing　a　viable　way　towards　expanding　the　candidates　for　direct　plasmonic　photocatalysis.