Palm kernel shell (PKS), a waste from the oil palm industry, has been utilized as filler in low-density polyethylene (LDPE) eco-composites in the present work. The effect of PKS content and coconut oil coupling agent (COCA) on tensile properties, water absorption, and morphological and thermal properties of LDPE/PKS eco-composites was investigated. The results show the increase of PKS content decreased the tensile strength and elongation at break, but increased the tensile modulus, crystallinity, and water absorption of ecocomposites. The presence of COCA as coupling agent improved the filler-matrix adhesion yield to increase the tensile strength, tensile modulus, crystallinity, and reduced water absorption of eco-composites. The better interfacial adhesion between PKS and LDPE with the addition of COCA was also evidenced by scanning electron microscopy studies. J. VINYL ADDIT. TECHNOL.,