Herein, PbI₂ nanostructured thin films were grown on glass substrates with different (0.5, 1.0 and 1.5 g) solute concentrations using a spin coating technique. The impact of the solute concentration on the structural, optical, nonlinear optical properties was examined thoroughly and was analyzed as a function of solute concentrations. The X-ray diffraction (XRD) patterns of the films confirm a hexagonal wurtzite structure with a preferred orientation along (001) plane. The band gap of the films was calculated using absorbance spectra and found to be about 2.41–2.56 eV. The refractive index (n), extinction coefficient (k), optical dielectric constant, SELF and VELF were investigated and analyzed. In addition, third order optical susceptibility (χ⁽³⁾), nonlinear refractive index (n₂) were also calculated. The obtained data shows that the prepared films are promising for optoelectronics applications.