Waste containing nanomaterials - or nanowaste - is an emerging safety concern worldwide, requiring environmentally sound management and regulation. Nanowaste includes manufacturing waste materials, end-of-life nano-enabled products, and waste (unintentionally) contaminated with engineered nanomaterials. More than 60 percent of engineered nanomaterials (up to 300,000 tons annually, and not including nanoplastics) are estimated to end up in landfill. There is a need for tangible solutions related to risk assessment, categorization, labeling, collection, storage, transport, recycling, and elimination.