Maleated castor oil (MACO) was prepared and blended with epoxy resin in 1:1 weight ratio. The prepared MACO-epoxy blend was characterized for its viscosity. Fly ash (10 wt %) was incorporated both in the 1:1 blend matrix as well as in the 100% epoxy resin matrix. Then curing was done by condensation polymerization reaction using 10 wt % of diethylene triamine (with respect to the total resin) in suitable reaction conditions. An interpenetrating cross-linked network was formed within the matrix between MACO and the epoxy molecules. The resultant MACO/epoxy blend matrix reinforced with fly ash showed significant enhancement in impact strength and damping properties compared to that of epoxy. The morphologies of the fabricated biocomposites were studied by scanning electron microscope.