With the increased concern about the rare-earth supply chain risk, recycling rare-earths from scrap is receiving significant attention. In this monograph, the studies of the rare-earth recycling technologies have been reviewed with respect to magnets, phosphors, batteries, polishing powders and others from the viewpoints of physical separation, hydrometallurgy, and pyrometallurgy. The important issues inherent in each scrap were pointed out. Particularly-important issues are dismantling, demagnetization, the separation from iron for the magnets, and the fine particle separation and the terbium dissolution for the phosphors. Emerging technologies, such as the automated dismantling methods for the magneta and the application of high gradient magnetic separation for the phosphors, together with a new extractant have been noted. A cost barrier before the actual implementation of the developed process should be overcome not only by the technologies, but also by the integration with a social system establishment.