| Native Name: | ምዕራብ አርማጭሆ |
| Type: | Woreda |
| Subdivision Type: | Zone |
| Subdivision Name: | [Mirab Gondar Zone] |
| Subdivision Type1: | Region |
| Subdivision Name1: | Amhara Region |
| Population As Of: | 2012 est. |
| Population Total: | 36,460 https://web.archive.org/web/20120805184429/http://www.geohive.com/cntry/ethiopia.aspx |
| Population Density Km2: | auto |
| Area Total Km2: | 2,465.11 |
| Area Footnotes: | [1] |
Mirab Armachiho (Amharic: ምዕራብ አርማጭሆ|lit=West Armachiho) is one of the woredas in the Amhara Region of Ethiopia. This woreda is named after "Armachiho", a province in northwestern Ethiopia along the border with Sudan and south of the Tekezé River.[2] Located at the northwestern point of the Semien Gondar Zone, Mirab Armachiho is bordered on the south by Metemma, on the west by Sudan, on the north by the Wolkait Tegede Woreda, on the northeast by Tegeda, and on the east by Tach Armachiho. Towns in Mirab Armachiho include Abderafi. Mirab Armachiho was part of former Sanja woreda.
Based on the 2007 national census conducted by the Central Statistical Agency of Ethiopia (CSA), this woreda has a total population of 31,730, of whom 17,400 are men and 14,330 women; 15,075 or 47.5% are urban inhabitants. The majority of the inhabitants practiced Ethiopian Orthodox Christianity, with 88.5% reporting that as their religion, while 11.4% of the population said they were Muslim.[3]