| Mashan County | |
| Settlement Type: | County |
| Pushpin Map: | China Guangxi |
| Pushpin Label: | Mashan |
| Pushpin Map Caption: | Location in Guangxi |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Autonomous region |
| Subdivision Name1: | Guangxi |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Nanning |
| Subdivision Type3: | Subdivisions |
| Seat Type: | County seat |
| Seat: | Baishan |
| Area Footnotes: | [1] |
| Area Total Km2: | 2345.33 |
| Population Footnotes: | [2] |
| Population Total: | 390900 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Coordinates: | 23.709°N 108.178°W |
| Postal Code Type: | Postal code |
| Postal Code: | 530600 |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Mashan County (; Standard Zhuang: Zhuang; Chuang: Majsanh Yen) is a county of Guangxi Zhuang Autonomous Region, China, it is under the administration of the prefecture-level city of Nanning, the capital of Guangxi. The northernmost county-level division of Nanning City, it borders the prefecture-level cities of Hechi to the north and Laibin to the northeast.
Mashan County is divided into 7 towns, 2 townships and 2 ethnic townships:[3]
492,500 in 2000, with 75.8% as Zhuang ethnic group population