Dulan County (Mongolian: ᠳᠤᠯᠠᠭᠠᠨ ᠰᠢᠶᠠᠨ; Tibetan: ཏུའུ་ལན་རྫོང་; Chinese: 都兰县) is a county of east-central Qinghai province, China.

It is under the administration of Haixi Mongol and Tibetan Autonomous Prefecture.

With an elevation of around 3,200 metres (10,000 ft), Dulan County has a subalpine semi-arid climate (Köppen BSk), with long, very cold and winters, and warm summers.

Average low temperatures are below freezing from early/mid October to mid/late April; however, due to the wide diurnal temperature variation, only December and January have an average high that is below freezing.

The monthly 24-hour average temperature ranges from −9.6 °C (14.7 °F) in January to 15.2 °C (59.4 °F) in July, while the annual mean is 3.41 °C (38.1 °F).