Saru (沙流郡 Saru-gun?, Ainu: Sat) is a district located in Hidaka Subprefecture, Hokkaido, Japan.
As of 2004, the district has an estimated population of 21,190 and a density of 12.21 persons per km². The total area is 1,735.83 km².
42°31′58″N 142°06′05″E / 42.5327055°N 142.101514°ECoordinates: 42°31′58″N 142°06′05″E / 42.5327055°N 142.101514°E (average of town offices)