Shizunai (静内郡 -gun) was a district located in Hidaka Subprefecture, Hokkaidō, Japan.
In 2004, the district had an estimated population of 22,581 and a density of 28.17 persons per km². The total area was 801.51 km².
On March 31, 2006, Shizunai District merged with Mitsuishi District to form the new district of Hidaka District. Mitsuishi District and Shizunai District were both dissolved with this merger.
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