In this study, nanosilica was synthesized from rice husk ash (RHA) using a simple heating method. The resulting nanosilica was characterized using several techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and simultaneous thermal analysis (STA). The white appearance of the nanosilica indicated minimal impurities, such as carbon or other elements. This observation was corroborated by the XRD pattern, which revealed that the silica was highly amorphous. The FTIR spectrum confirmed the formation of nanosilica, showing characteristic peaks corresponding to Si–O–Si and Si–O bonds. SEM images demonstrated that the nanosilica particles were agglomerated, with an average diameter of approximately 12 nm. These findings highlight the potential of rice husk as a raw material for producing valuable silica-based products through a simple and efficient method.