Green nanomaterialsNanomaterial represent a promising avenue for addressing various societal challenges, ranging from healthcare to environmental sustainabilityEnvironmental sustainability and energyEnergy applicationsApplications. This chapter provides an in-depth exploration of green nanomaterialsNanomaterial, beginning with their definitions, significance, and range of applicationsApplications. BiocompatibilityBiocompatibility assessment techniquesTechnique are discussed extensively, emphasizing the importance of methodologies used to evaluate biocompatibilityBiocompatibility, toxicological studies, and risk assessment within the context of sustainabilitySustainability. In medicineMedicine, biocompatibleBiocompatible green nanomaterialsNanomaterial offer innovative solutions for targeted drug deliveryTargeted drug delivery, therapeutic applicationsApplications, imaging contrast agents, and diagnostic tools, thereby revolutionizing healthcare practices. Similarly, inNanotechnology and environmental sustainability environmental sustainabilityEnvironmental sustainability, these materials play a crucial role in water treatment, heavy metalMetal removal, soil healthSoil health enhancement, agricultural sustainabilitySustainability, and energyEnergy storage. Despite the immense potential of green nanomaterialsNanomaterial, challenges such as regulatory concerns, sustainabilitySustainability of synthesisSynthesis processes, and potential ecological impacts are also addressed. However, emerging trends point towards greener synthesis methodsSynthesis methods, collaborative research initiatives, and advancements in risk assessment techniquesTechnique. Looking towards the future, the potential advancements in green nanomaterialsNanomaterial offer hope for addressing environmental concerns, promoting sustainable development, and improving human healthHealth. By embracing interdisciplinary collaboration, informed decision-making, and a commitment to responsible innovation, we can harness the transformative power of green nanomaterialsNanomaterial to create a more sustainable and prosperous future for all.