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Mesoporous silica has been successfully synthesized from rice husk ash (RHA) and corn cobs ash (CCA) using alkaline extraction followed by acid precipitation. In this work, rice husk and corn cobs were combusted inside a furnace at 700°C to produce rice husk ash (RHA) and corn cobs ash (CCA). These ashes were treated by using NaOH aqueous and acid solutions, such as HCl or CH3COOH, to produced high purity silica. Thermal devolatilization of rice husk and corn cobs were studied by TGA analysis. The composition and morphology of the silica have been confirmed with FTIR analysis shows that the silica obtained has a group of silanol (Si-OH) and a group of siloxane (Si-O-Si), also the morphology was confirmed with SEM-EDX and x-ray diffraction (XRD) which stated that the obtained products were amorphous and also mesoporous silica. The pore volume and surface area of silica obtained have been done using Brunauer-Emmet-Teller (BET) method. Silica from corn cobs with CH3COOH acidification has a higher surface area 360.5 m2/g and an average pore diameter 8.04 nm, while silica from rice husk with HCl acidification has a surface area 236 m2/g and an average pore diameter 9 nm.