Nutshells, the hard, protective outer coverings of nuts, are gaining attention as a valuable resource in the field of renewable materials. Rich in lignocellulosic content, nutshells like those from almonds, walnuts, and coconuts can be processed into bio-based products. They can be ground into fine powders for use as natural fillers in composites, enhancing the mechanical properties of biodegradable plastics and reducing reliance on petroleum-based materials. Additionally, nutshells can be converted into activated carbon through pyrolysis, serving as an eco-friendly alternative for water purification and air filtration. Their utilization not only promotes waste reduction and sustainable material cycles but also contributes to the advancement of green technologies and the circular economy.