Al₂O₃ and TiO₂ nanoparticles were synthesized using sol-gel method. The structures of Al₂O₃ and TiO₂ nanoparticles were investigated using X-ray diffraction (XRD) study. The morphology of nanoparticles was investigated by scanning electron microscopy (SEM) analysis. The FE-SEM images showed that most of the nanoparticles obtained for Al₂O₃ and TiO₂ nanoparticles have spherical shape with a particle size of 14 nm and 43 nm for Al₂O₃ and TiO₂ nanoparticles respectively. The absorption spectra of Al₂O₃ and TiO₂ nanoparticles suspended in deionized water were recorded at room temperature using UV-visible spectroscopy. The absorption spectra show a strong peak at 344 nm and 483 nm for Al₂O₃ and TiO₂ respectively. The results on absorption spectra are in good agreement with those investigated by XRD which confirmed the formation of Al₂O₃ and TiO₂.