Yakumo is a town located in Oshima Subprefecture, on the island of Hokkaido, Japan. It lies in the southern part of the island, within the Oshima region.
As a municipality in Hokkaido, Yakumo is administered as part of Oshima Subprefecture, one of the subprefectural jurisdictions that organize local government across Japan's northernmost main island.