Furuu (古宇郡 Furuu-gun?) is a district located in Shiribeshi Subprefecture, Hokkaido, Japan.
As of 2004, the district has an estimated population of 3,278 and a density of 14.25 persons per km². The total area is 230.06 km².
Coordinates: 43°09′37″N 140°27′22″E / 43.160151°N 140.456055°E