Bor-Öndör (Mongolian: Бор-Өндөр) is a city in Khentii Province in eastern Mongolia.
The City is at an elevation of 1300 meters and located close to the northern semi-desert edge of the Gobi Desert.
The underground mine, open pit and mineral processing plant, which is the only mineral processing plant in the country, are operated by the Mongolrostsvetmet JV company.
All fluorspar products are exported to Russia, Ukraine, and other countries by rail.
Unpaved roads connect Bor-Öndör with Darkhan sum centre (43 km) of Khentii Province and with the Khentii Province capital Öndörkhaan (144 km) via Darkhan.