[en] Polybenzoxazine/epoxy-fumed silica filled composites have been prepared by blending benzoxazine with epoxy (EP) in presence of fumed silica (FS). It has been observed that the thermal stability of the composites increased with increasing amount of fumed silica in the composite composition. Mechanical properties of the composites have been investigated by using tensile and flexural tests. Composites consist of 4 wt% fumed silica in the polymeric matrices, exhibited higher tensile and flexural strength than neat polybenzoxazine, epoxy and their polymeric metrics blend. Prepared composites possess better mechanical and thermal properties than the neat polymers, as well as easy processibilty which can make them good candidates to prepare of complex reinforced structures for various industrial applications. (paper)