The field of separation sciences is experiencing a profound transformation driven by sustainability imperatives. The chapter explores pioneering sustainable separation processes and technologies poised to revolutionize chemical and industrial separations. Green solvents and extraction techniques reduce environmental footprints, while membrane separation technologies offer energy-efficient and selective solutions. Principles of waste minimization and circular economy promote reduced waste generation and recycling, conserving valuable resources. Energy-efficient separation processes and integration of renewable energy sources further minimize carbon footprints. Nanotechnology is a game-changer in separation sciences, providing solutions through functionalized nanoparticles, nanomembranes, and targeted drug delivery systems that improve selectivity, precision, and resource efficiency while reducing energy consumption and environmental impact. Techniques for process intensification, such as reactive distillation and membrane reactors, maximize resource utilization. These advancements, taken together, create the foundation for a more sustainable and ecologically conscious future for separation sciences.