n this work, mechanical properties for three types of polymeric blends and polymeric composites were fabricated and evaluated.The first group was prepared from (polyvinyl chloride: polypropylene (PVC: PP)) in different ratios of polypropylene (5, 10 and 15%). The second group was prepared by adding 1% ethylene propylene diene monomer (EPDM) to the first group samples. Similarly, the third group was prepared by adding1%acrylonitrile-butadiene-styrene (ABS) to the first group samples. All samples were prepared by melt blending technique usinga twin-screw extruder. The optimum sample from the three groups was reinforced in different ratios of titanium dioxide (TiO2)nanoparticles. The resultsof mechanical propertiesshow that the polymer blend (PVC-PP-EPDM) has higher values in compressive strength, flexural modulus, impact strength and fracture toughness, whereas the polymer blend (PVC-PP-ABS) hashigher values in flexural strength. The highest compressive strength, flexural modulus, impact strength and fracture toughness were 240MPa, 2.5GPa, 69.7kJ/m2and 13.2MPa√m for ternary polymers blend (94%PVC: 5%PP: 1%EPDM), whereas the high value of flexural strength was 78MPa for ternary polymer blend (94%PVC: 5%PP: 1%ABS). Addition of TiO2nanoparticleshasled to the improvement in mechanical properties of prepared composites. Morphology analysingpointedout that the composites have a homogeneous structure formation, as a result of the high efficiency for each of TiO2nanoparticles and EPDM in a composite