Sustainable CNC machining increasingly relies on effective coolant management to reduce environmental impact, cut costs, and improve machining performance. Coolants are essential for lubrication, heat control, and chip removal, but improper handling leads to waste and higher expenses. Proper management practices—such as regular monitoring, filtration, recycling, automation, and using eco-friendly coolants—help extend coolant life, maintain machine health, and ensure consistent product quality. Although initial investment may be a barrier, the long-term benefits include cost savings, reduced waste, and enhanced operational efficiency. Future advancements in IoT and AI are expected to further optimize coolant systems, reinforcing sustainability in CNC machining.