Polyamide blending is a thoroughly investigated area, with aims of improving various aspects including density, toughness, moisture absorption, and cost. Due to the immiscibility of polyamides with many commodity polymers such as polypropylene (PP), a compatibilization approach is required to obtain a blend with desirable mechanical properties. However, even in well-compatibilized blends of polyamides with commodity polymers, the addition of the second polymer tends to significantly reduce the tensile strength and modulus of the blend. In this study, a ternary polymer blending approach was taken by blending nylon 6 (PA6) systems with PP and bio-based poly(lactic acid) (PLA). This approach was targeted to improve the hydrophobicity and price, while maintaining high tensile strength and modulus via the incorporation of PLA. Binary systems (PA6-PP) and ternary systems (PA6-PP-PLA) were compared at different blending ratios, with and without compatibilizing agents. The mechanical properties of the resulting blends were characterized via tensile and flexural analysis, impact testing, and moisture absorption testing. The phase morphology and dispersion was thoroughly investigated using scanning electron microscopy as well as atomic force microscopy. The crystallization behaviour of the blends was studied using differential scanning calorimetry. Overall, through a reactive extrusion approach, compatibilized ternary blends of PA6-PP-PLA were achieved with excellent properties comparable to those of neat PA6, with reduced density and improved hydrophobicity."