<p>Here, ferroelectric ceramic perovskite (BaTiO₃) nanocrystalline particles were added to the PVA matrix in different amounts using the casting technique to create PVA-BaTiO₃ films. The structural change of PVA as the BaTiO₃ concentration rose was investigated using FTIR and SEM. The infrared spectra reveal that the response of pure PVA changes depending on the quantities of BaTiO₃ nanoparticles. This, in turn, causes variations in the magnitude of the absorption spectrum caused by hydrogen bonding. SEM photographs disclosed a scattered cluster of evenly disseminated nanoparticles in the PVA matrix. Findings from electric analysis indicate that dielectric loss, ac conductivity, and frequency-dependent of the dielectric constant all contribute to improved dielectric characteristics. The conductivity increases from 8.9 × 10^–4 Ω⁻¹m⁻¹ to 3.11 × 10^–3 Ω⁻¹m⁻¹ (by 3.49 times) when 6wt% BaTiO₃ is added inside the PVA matrix at frequency 5 MHz. Nanocomposite samples’ absorbance spectra differed from those of the pure PVA sample in that the former shifted toward higher wavelength values at the absorption edge. Also, the transmittance decreased from 88.8% for PVA to approximately 63.9% at the largest concentration of BaTiO₃. This improves the sample’s optical conductivity and refractive index while simultaneously reducing the energy gap. The band gaps decrease from 4.50 ± 0.225 eV to 2.70 ± 0.135 eV for the indirect transition (at 6.0 wt%), according to the optical studies. At the highest concentration of BaTiO₃, the refractive index increases from 1.4428 ± 0.072 for pure PVA to 2.0524 ± 0.103 for PVA-6.0 wt% BaTiO₃. Results show that PVA-BaTiO₃ nanocomposite films are good candidates for use as a layer in optoelectronic devices and thin-film transistors. Moreover, refractive index increases are primarily advantageous for enhancing the visual qualities of electronic displays, including televisions with LCD, OLED, and quantum dot QDLED.</p>