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Nanofluids with full-spectrum absorption properties are highly desirable for direct solar thermal energy conversion applications.In this work,Ag and CsWO3 nanofluids,which exhibit absorption both in the visible and near-infrared (NIR) region,are integrated to obtain two-component hybrid nanofluids.The hybrid nanofluids show broad band absorption with a solar weighted absorption fraction of 99.6％,compared to 18％ and 54％ for the base liquid (ethylene glycol) and CsWO3 nanofluids,respectively.The highest photo-thermal conversion performance for the hybrid nanofluids is obtained with Ag/CsWO3 weight ratio of 3/7.The solar thermal conversion efficiency of the optimum hybrid nanofluids is 67％,10％ and 15％ higher than single Ag and CsWO3 nanofluids.The two-component hybrid nanofluid provides an alternative for making the best use of solar energy.