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This study aims to fabricate thick films of polyvinyl alcohol containing (SiC-BaTiO3) nanoparticles in order to improve their structural, optical, and electrical characteristics. The (PVA-SiC-BaTiO3) nanocomposite films are made utilize the casting method. According to optical microscope images, the (SiC-BaTiO3) nanoparticles create a persistent network inside the polymer compared to pure (PVA). FTIR reveals that the peak position, peak shape, and intensity are shifting. When (SiC-BaTO3) nanoparticle concentrations were increased to (6 wt%), optical tests revealed that the absorbance of (PVA-SiC-BaTiO3) nanocomposites enhanced from 50 to 98%. Meanwhile, the energy gap of (PVA-SiC-BaTiO3) nanocomposites declined from (4.42 to 3.56) eV and from (4.1 to 2.85) eV for the allowed and forbidden indirect transitions, respectively. These findings could be important for using (PVA-SiC-BaTiO3) nanostructures in diverse optics applications and nanotechnology. As well as an increase in optical parameters including optical conductivity, real and imaginary dielectric constants, refractive index, absorption coefficient, and extinction coefficient. The dielectric loss (ε″) and dielectric constant (ε′) for nanocomposites reduce as the frequency of the applied electrical field rises but increase as the concentration of nanoparticles (NPs) rises. When the (SiC-BaTiO3) concentration reached (6 wt%) at a frequency of 100 Hz, A.C. electrical conductivity (σa.c) and dielectric constant increases by around 90% and 130%, respectively. Based on the results, doping PVA with (SiC-BaTiO3) NPs enhanced the optical, structural, and A.C electrical properties, making the (PVA-SiC-BaTiO3) nanostructures promising materials for various optoelectronic nanodevices. [ABSTRACT FROM AUTHOR]