Oshika (牡鹿郡 Oshika-gun?) is a district located in Miyagi Prefecture, Japan.
As of 2003, the district has an estimated population of 16,069 and a population density of 115.80 persons per km². The total area is 138.76 km².
Coordinates: 38°27′11″N 141°26′42″E / 38.45306°N 141.44500°E