Qusum County (Tibetan: ཆུ་གསུམ་རྫོང; Chinese: 曲松县) is a county under the administration of the prefecture-level city of Shannan in the Tibet Autonomous Region, China.

In 1999 the county had a population of 15,541 inhabitants. The capital is Qusum.

Qusum County contains 2 towns and 3 townships.

Name	Chinese	Hanyu Pinyin	Tibetan	Wylie
Towns
Qusum Town	曲松镇	Qǔsōng zhèn	ཆུ་གསུམ་གྲོང་རྡལ།	chu gsum grong rdal
Lababsa Town	罗布沙镇	Luóbùshā zhèn	ལ་བབས་ས་གྲོང་རྡལ།	la babs sa grong rdal
Townships
Shakjang Township	下江乡	Xiàjiāng xiāng	ཤག་བྱང་ཤང་།	shag byang shang
Qundo'gyang Township	邱多江乡	Qiūduōjiāng xiāng	ཆུ་མདོ་རྒྱང་ཤང་།	chu mdo rgyang shang
Tözik Township	堆随乡	Duīsuí xiāng	སྟོད་གཟིགས་ཤང་།	stod gzigs shang