Coupling of individual properties between recycled high-density polyethylene (rHDPE) and ethylene vinyl acetate (EVA) blends as polymer matrix which has different chemical structure requires coupling agent to improve their interfacial adhesion. Therefore, benzyl urea (BU) was examined to access its potential as the coupling agent in rHDPE/EVA composites. RHDPE/EVA blends with ratio of 50/50 and different loadings of calcium carbonate (CaCO3) as filler from 0 to 25 phr were prepared by using melt blending technique Brabender Plasticorder at 190 °C and rotor speed of 50 rpm for 10 minutes. The compatibilization of rHDPE/EVA blends were enhanced by the addition of 6 phr of the BU. The tensile, water absorption and morphological properties were studied. Tensile properties such as tensile strength and Young’s modulus were improved while the elongation at break was reduced by the addition of BU. The water absorption resistance was also improved due to the enhanced interfacial adhesion and intercalation between rHDPE and EVA as observed from the SEM images.