Gu County or Guxian (simplified Chinese: 古县; traditional Chinese: 古縣; pinyin: Gǔ Xiàn) is a county in the south of Shanxi Province, China, under the administration of the prefecture-level city of Linfen.

[1] The county spans an area of 1,196 square kilometers, and has a population of 91,798 as of 2010.

[1][2] The area was first incorporated under Emperor Xiaozhuang of the Northern Wei dynasty in 528 CE under the name Anze County (安泽县).

[3] The county was placed under the administration of Qinzhou [zh] upon its formation in 596 CE, during the Sui dynasty.

[1][6] The county government is stationed in the town of Yueyang [zh].