Significant　efforts　have　been　put　into　the　recycling　of　bulk　Nd-Fe-B　sintered　magnet　wastes　around　the　world　in　the　past　decade　because　bulk　Nd-Fe-B　sintered　magnet　wastes　are　valuable　secondary　rare-earth　resources.　There　are　two　major　facts　behind　the　efforts.　First,　the　waste　magnets　contain　total　rare-earth　content　as　high　as　more　than　30　wt.%,　which　is　higher　than　most　natural　rare-earth　mines.　Second,　the　waste　magnets　maintain　the　physical　and　chemical　properties　of　the　original　magnets　even　with　deterioration　of　the　properties　on　surfaces　due　to　corrosion　and　contamination.　In　this　review,　various　techniques　for　recycling　bulk　Nd-Fe-B　sintered　magnet　wastes,　the　overall　properties　of　the　recycled　Nd-Fe-B　sintered　magnets,　and　the　mass　production　of　recycled　magnets　from　the　wastes　are　reviewed.