 This study investigates the electrical, thermal and mechanical properties of hybrid natural fiber composite made with fly ash waste as filler material, unsaturate polyester resin as matrix material, alkali treated for sealus vulgaris fiber, PVF, as primary filler, and nanosilica added at a constant percentage. The study found that the composite showed an increasing trend in mechanical and electrical properties with varying weight percentages of PVF until 6%, after which a decreasing trend was observed. However, for thermal conductivity and water absorption tests, the results showed a regular decreasing trend until 6% PVF, followed by an increasing trend. The composite of 6% PVF and 1% SiO2 showed better electrical, thermal, and mechanical properties. This article was authored by B. Girukathik Babu, D. Prince Winston, P. V. Oravind Bhaskar, and others.