Rice Husk (RH) natural fiber that forms around rice grains during their growth accounts for 20% of rice produced annually worldwide and can be used as a filler in composite materials in various polymer matrices. Rice Husk Ash (RHA) reinforced unsaturated polyester composites containing 5% to 25% rice husk ash with respect to the weight of unsaturated polyester resin have been prepared by simple casting process. In this method, raw materials used are unsaturated polyester resin and rice husk ash. Methyl ethyl ketone peroxide (MEKP) is used as hardener (2 wt % of unsaturated polyester resin). Different percentage of rice husk ash and unsaturated polyester resin were taken to prepare composite from 0 to 25 wt % and raw materials were mixed very carefully for about 15 minutes. Then the composite material was released from the mould after drying for 1 hour. It has been found that the properties like hardness number and flexural strength increased with 10% of rice husk ash with a decrease in the tensile strength; also the impact test increases with 5 % of rice husk ash.