Mengshan County (simplified Chinese: 蒙山县; traditional Chinese: 蒙山縣; pinyin: Méngshān Xiàn) is a county under the administration of Wuzhou City in northeastern Guangxi, China. Its seat is located in Mengshan Town.

Battles were fought in Mengshan during the Tai Ping Rebellion in 1851 and 1852.

Taiping soldiers captured the walled city of Yongan(Chinese: 永安; pinyin: yǒng ān)(now Mengshan Town) from Qing forces on September 25, 1851. The remains of sections of wall, replica cannons, other artifacts are preserved and now form a tourist attraction on the northern end of Mengshan Town.

Mengshan County has nine fourth-level administrative units: Six Towns, One Townships and Two Yao ethnic townships.^[1]

Tianshu Canyon (simplified Chinese: 天书峡谷; traditional Chinese: 天書峽谷; pinyin: San tiān shū xiá gǔ) is located 5 kilometers east of Mengshan town. Tianshu Canyon has a has impressive stone formations and natural waterfalls.

Located 13 kilometers east of Mengshan Town is San Chong Historic Battle Ground (simplified Chinese: 三冲古战场; traditional Chinese: 三衝古戰場; pinyin: San Chong Gu Zhan Chang) The site of a battle on April 8, 1852 during the Taiping Rebellion.

In Mengshan county in 1968 during the Cultural Revolution Cannibalism occurred. 500 people were killed in a five-day period in mid-June.^[2][3][4]

Many Middle Schools were closed in Mengshan in 1968 and remained closed until 1974.

Mengshan does not have an airport or railway. The closest airports to Mengshan are Guilin Liangjiang International Airport and Wuzhou Airport. The main road which runs North-South through Mengshan is the G321 National Highway (simplified Chinese: 国道G321; traditional Chinese: 國道G321; pinyin: Guódào G sān èr yāo). Mengshan town is 145 km by road south of Guilin, 82 km by road south of Yangshuo, and 187 km by road north of Wuzhou. The G321 is a single carriageway with 2 lanes.

There are direct bus services from Mengshan town to Guilin, Wuzhou and many cities in the Guangdong Pearl River Delta including Guangzhou and Zhongshan.

Although similar to Guilin and Yangshuo with attractive karst scenery, potential for outdoor activities, such as caving, rafting, climbing and mountain biking, Mengshan does not have any significant tourist industry or infrastructure.

Agriculture and Forestry are the main Industries in Mengshan. Rice is grown primarily for domestic consumption. Crops and fruit such as butter tea, citrus fruit, apple, chestnut, pear, persimmon, passion fruit, star anise, sugar cane and ginger are grown for sale. Silkworms are also an important source of income for many villages. Vanilla is grown in Changping Yao Ethnic Township (simplified Chinese: 长坪瑶族乡; traditional Chinese: 長坪瑤族鄉; pinyin: Cháng Píng Yáo Zú Xiāng) and in other parts of Mengshan.

Tea is grown in most villages for domestic use, as well as for sale. Mengshan's climate is ideal for growing tea. Coffee mainly of the Arabica variety grows well in Mengshan county in frost free areas but planting is on small scale.

Mengshan has productive vineyards, and further vineyards are being developed.^{[5] [6]}

Remittances from rural migrant workers significantly contribute to the local economy.

• Liang Yusheng (1926–2009) a famous Chinese wuxia novelist who spent his early years in Wenwei Village (文圩村 ; wén wéi cūn) Mengshan.
• Chen Manyuan 陳漫遠(1911–1986) a member of the Central Committee of the CCP’s Eighth Congress (1956)