Guzhang County (simplified Chinese: 古丈县; traditional Chinese: 古丈縣; pinyin: Gǔzhàng Xiàn) is a county of Hunan Province, China.

The county is the 2nd least populous administrative unit of the counties or county-level cities (after Shaoshan City) in the province, it is under the administration of Xiangxi Autonomous Prefecture.

[5] Guzhang County includes the following ethnic groups (Wu 2007, 2010).

The Guzhangian Age of the Cambrian Period is named after Guzhang County.

In particular, the Louyixi Global boundary Stratotype Section and Point is named after the Louyixi Town in Guzhang County.