<p>Polymer-based nanocomposites hold great promise as ideal materials for use in flexible, cutting-edge photonic and electronic nanodevices. Polyvinyl alcohol (PVA) based polymer nanocomposites have recently attracted significant research attention because of their outstanding electrical properties. This study investigates the incorporation of nanoparticles (TiO₂ and SiC) into a PVA matrix to comprehensively examine its electrical properties. In our study, the (PVA/TiO₂-SiC) nanocomposites were prepared by incorporating TiO₂-SiC nanoparticles into the PVA matrix through the casting technique. SiC was added into PVA-TiO₂. The concentrations of SiC were varied at 1, 2 and 3 wt% to investigate their effects on the material properties. The inclusion of nanoparticles in the matrix generates an increased number of negative charge carriers, which interact strongly with the positive carriers on the polymer surface. The incorporation of TiO₂ and SiC into the PVA matrix led to a significant increase in real dielectric constant, rising sharply from 150 for pure PVA to a maximum of 600 for the PVA/TiO₂–SiC composite, while maintaining a loss factor of 2.8. The highest observed a.c. conductivity was 3.12 × 10⁻⁶ S/m, attributed to the enhanced availability of charge carriers for polarization. The prepared nanocomposite thin films exhibit excellent electrical properties and favourable dielectric behaviour, highlighting their potential for applications in photonics and electronic nanodevices.</p>