Shangdu County (Mongolian: ᠱᠠᠩᠳᠤ ᠰᠢᠶᠠᠨ; Chinese: 商都县) is a county of south-central Inner Mongolia, China. It is under the administration of Ulanqab City and has an area of 4,353 square kilometres (1,681 sq mi), and in 2020 had about 173,000 inhabitants.

Shangdu County is made up of 6 towns and 4 townships.