Obihiro is a city in Tokachi Subprefecture, Hokkaido, Japan. Obihiro is the only designated city in the Tokachi area. As of July 31, 2023, the city had an estimated population of 163,084. The next most populous municipality in Tokachi is the adjacent town of Otofuke, with less than a third of Obihiro's population. The city had approximately 500 foreign residents in 2008. The city contains the headquarters of the Fifth Division of the Northern Army of the Japan Ground Self-Defense Force. It also hosts the Rally Japan World Rally Championship-event.

Hokkaido is the second-largest island of Japan and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel.