Nyū (丹生郡 Nyū-gun?) is a district in Fukui Prefecture, Japan.
As of 2005, the district has an estimated population of 23,995 and a population density of 157 persons per km². The total area is 152.83 km².
Coordinates: 35°58′12″N 136°04′05″E / 35.97000°N 136.06806°E