Qu County or Quxian (simplified Chinese: 渠县; traditional Chinese: 渠縣; pinyin: Qú Xiàn) is a county in the northeast of Sichuan Province, China. It is the westernmost county-level division of the prefecture-level city of Dazhou.

Formerly known as Dangqu (宕渠), the county is best known for historic monuments. Namely, a partially preserved mausoleum complex, featuring gate towers, or que, belonging to the Shen (沈) family, which dates back to the Han dynasty.

From 2014 to 2018, the Han dynasty site of Chengba (城坝遗址) near Tuxi in Qu county was excavated. A number of eave tiles with Chinese characters "dangqu" (宕渠) have been found, leading archaeologists to believe that this was the site of the Han dynasty city of Dangqu.

Qu County comprises 3 subdistricts, 28 towns and 6 townships:

Qu County has a monsoon-influenced humid subtropical climate (Köppen Cwa).