This study investigates the optical properties of polyvinylidene fluoride (PVDF) polymer nanocomposite films incorporating SrTiO₃/carbon nanotubes (CNTs) as nanofillers. The films were prepared using the solution casting technique, and their structure and properties were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The addition of nanofillers influenced the crystalline structure, morphology, and optical properties of the films. SEM images revealed a spherulite morphology, which is a spherical aggregate of crystalline polymer chains. The incorporation of 0.1 wt% SrTiO₃/CNTs increased the band gap, refractive index, and nonlinear optical properties of the PVDF films, indicating their potential for optoelectronic applications such as solar cells, image sensors, and organic light-emitting diodes. The results highlight the synergistic effects of SrTiO₃ and CNTs on the optical properties of the nanocomposites, providing new insights into the design of functional materials.This study investigates the optical properties of polyvinylidene fluoride (PVDF) polymer nanocomposite films incorporating SrTiO₃/carbon nanotubes (CNTs) as nanofillers. The films were prepared using the solution casting technique, and their structure and properties were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The addition of nanofillers influenced the crystalline structure, morphology, and optical properties of the films. SEM images revealed a spherulite morphology, which is a spherical aggregate of crystalline polymer chains. The incorporation of 0.1 wt% SrTiO₃/CNTs increased the band gap, refractive index, and nonlinear optical properties of the PVDF films, indicating their potential for optoelectronic applications such as solar cells, image sensors, and organic light-emitting diodes. The results highlight the synergistic effects of SrTiO₃ and CNTs on the optical properties of the nanocomposites, providing new insights into the design of functional materials.