This review article discusses the use of natural fiber reinforced polymer composites (NFPCs) and their applications. Natural fibers are eco-friendly and sustainable, making them attractive for use in polymer composites. The article reviews the properties of NFPCs, the effects of chemical treatments on their properties, and their applications in various industries such as automotive, construction, aerospace, and sports. It also highlights the challenges associated with NFPCs, such as high water absorption, inferior fire resistance, and lower mechanical properties. The article emphasizes the importance of chemical treatments in improving the adhesion between natural fibers and polymer matrices, which enhances the physical and thermal properties of NFPCs. The review also discusses the mechanical, flame retardant, biodegradable, energy absorption, tribological, and water absorption characteristics of NFPCs. The applications of NFPCs in the automotive industry are also highlighted, including their use in car interiors, door panels, and other components. The review concludes that chemical treatments are essential for improving the performance of NFPCs and that they have significant potential in various industries due to their eco-friendly and sustainable nature.This review article discusses the use of natural fiber reinforced polymer composites (NFPCs) and their applications. Natural fibers are eco-friendly and sustainable, making them attractive for use in polymer composites. The article reviews the properties of NFPCs, the effects of chemical treatments on their properties, and their applications in various industries such as automotive, construction, aerospace, and sports. It also highlights the challenges associated with NFPCs, such as high water absorption, inferior fire resistance, and lower mechanical properties. The article emphasizes the importance of chemical treatments in improving the adhesion between natural fibers and polymer matrices, which enhances the physical and thermal properties of NFPCs. The review also discusses the mechanical, flame retardant, biodegradable, energy absorption, tribological, and water absorption characteristics of NFPCs. The applications of NFPCs in the automotive industry are also highlighted, including their use in car interiors, door panels, and other components. The review concludes that chemical treatments are essential for improving the performance of NFPCs and that they have significant potential in various industries due to their eco-friendly and sustainable nature.