<p>Crustacean shell waste (CSW), generated annually at approximately 11.9 million tons, is predominantly managed through landfilling and incineration. This linear disposal imposes environmental burdens while undervaluing a renewable resource rich in chitin, proteins, and calcium carbonate. Current industrial chitin and chitosan production relies on energy- and chemical- intensive processes, suffers from inconsistent product quality, and recovers only a small fraction of the theoretical potential. This opinion advocates biological valorization, via microbial fermentation and enzymatic offers a technically feasible and environmentally superior alternative for sustainable chitin extraction and conversion. We analyze feasible biotransformation routes, key enabling technologies, and the bottlenecks limiting scale-up, and we highlight a paradigm shift from merely extracting chitin to using it as a fermentable, nitrogen-rich platform substrate for producing high-value chemicals. Integrating synthetic biology, bioprocess engineering, and lifecycle assessment could reposition CSW as a cornerstone feedstock of a sustainable bioeconomy. Such a transition not only addresses waste management challenges but also aligns marine byproduct utilization with circular economy principles and climate mitigation goals.</p>