The effects of de-oiled cashew nutshell powder (CNSP) and eggshell powder (ESP) on the mechanical properties of linear low density polyethylene (LLDPE) composites were studied. The LLDPE composites were prepared with 150 μm particle sizes of 30%wt. ESP and varying amount of CNSP (10, 20, 30 wt.%) using injection molding machine at a hopper and nozzle temperatures of 200oC and 220oC respectively and at rotor speed of 60 rpm. Results showed that the tensile, flexural and impact properties decreased with increasing CNSP filler. Whilst the mechanical properties of ESP-filled composites were lower than those of the non-ESP composites, there was a drastic drop in the composite with 20%wt. CNSP.