Mashike (増毛郡; -gun) is a district located in Rumoi Subprefecture, Hokkaido, Japan.
As of 2004, the district has an estimated population of 5,736 and a density of 15.52 persons per km². The total area is 369.64 km².
Town
In July of 2004, the city of Rumoi, the town of Obira in Rumoi District, and the town of Masahike formed the South Rumoi Three-Municipality Merger Board, aiming at merging the three, in which case Rumoi and Masahike Districts would cease to exist.
