is a town located in Oshima Subprefecture, Hokkaido, Japan.
As of 30 October 2016, the town has an estimated population of 5,694. The total land area is 310.75 km<sup>2</sup>.
Oshamambe faces Uchiura Bay, which is a bay of the Pacific Ocean.
Setana Line ran from Kunnui Station. There used to be Asahihama station between Oshamambe Station and Shizukari Station.
Plans are in place to build a station at Oshamambe and construction is underway on the Hokkaido Shinkansen line. The section between Hakodate and Sapporo should be completed by 2030.