The Interior Division is an administrative division of the state of Sabah in east Malaysia. It occupies the southwest portion of Sabah, bordered by the neighbouring state of Sarawak on its west. With an area of 18,298 square kilometres, it covers 24.9% of Sabah's territory and is home to approximately 14.7% of Sabah's total population.
The coastal parts of the Division are settled mainly by Bruneian Malays, whereas the inland areas to the east of the Crocker Range are mostly settled by various subgroups of the Kadazandusun people. The town of Tambunan is considered to be a major centre of Kadazan culture, while Tenom is the largest town in the heartland of the Murut people. In addition, there are large numbers of Chinese people in most of the towns, particularly Beaufort, Keningau and Tenom. The majority of the Division's ethnic Chinese residents are of the Hakka subgroup.