Qumarlêb County (Tibetan: ཆུ་དམར་ལེབ་རྫོང་།; Chinese: 曲麻莱县) is a county in the northeast of the Yushu Tibetan Autonomous Prefecture, south-central Qinghai province, China.

With an elevation of around 4,200 metres (14,000 ft), Qumarlêb County has an alpine climate (Köppen ETH), with long, very cold winters, and short, cool and rainy summers.

Average low temperatures are below freezing from mid September to late May; however, due to the wide diurnal temperature variation, average highs are only below freezing from mid/late November until early March.

The monthly 24-hour average temperature ranges from −14.5 °C (5.9 °F) in January to 8.9 °C (48.0 °F) in July, while the annual mean is −2.13 °C (28.2 °F).

Over three-fourths of the annual precipitation of 406 mm (16.0 in) is delivered from June to September.