<p>A study was conducted to investigate the shrinkage and tensile properties of polypropylene (PP)/polyamide (PA)/microfibrillated cellulose (MFC) composites. The results revealed a significant reduction in shrinkage, with a maximum decrease of 44% in the inflow direction and 47% in the crossflow direction. PA had no noticeable impact on shrinkage reduction, while maleic anhydride grafted polypropylene (MAPP) and MFC demonstrated a positive effect due to improved interfacial bonding and denser samples with fewer voids. The optimal composite formulation, consisting of 5% PA, 2% MAPP, and 25% MFC, resulted in a 24% increase in tensile modulus and a 5% improvement in tensile stress compared to pure PP. The enhancements in both shrinkage and tensile properties were further confirmed by scanning electron microscopy (SEM) analysis of the fractured surfaces of the composites. The composite samples showed higher temperature degradation than that of PP and PA66 which also confirm the stability on the shrinkage and tensile properties of the composites. These findings suggest that MFC can be an effective filler to improve the mechanical, dimensional and thermal stability of PP-based composites, making them more suitable for applications such as food packaging, where performance and shelf-life are critical.</p>