| Official Name: | Achacachi Municipality |
| Settlement Type: | Municipality |
| Pushpin Map: | Bolivia |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location of the Achacachi Municipality within Bolivia |
| Subdivision Type: | Country |
| Subdivision Name: | Bolivia |
| Subdivision Type1: | Department |
| Subdivision Name1: | La Paz Department |
| Subdivision Type2: | Province |
| Subdivision Name2: | Omasuyos Province |
| Seat Type: | Seat |
| Leader Title: | Mayor |
| Leader Name: | Constancio Gutierrez |
| Leader Title1: | President |
| Leader Name1: | Bernabé Paucara Bautista (2007) |
| Established Title: | Foundation |
| Unit Pref: | Imperial |
| Area Total Km2: | 1072 |
| Population As Of: | 2001 |
| Population Total: | 70503 |
| Population Blank1 Title: | Ethnicities |
| Population Blank1: | Aymara |
| Population Blank2 Title: | Religions |
| Timezone: | BOT |
| Utc Offset: | -4 |
| Coordinates: | -16.0833°N -68.6667°W |
| Elevation M: | 3823 |
| Website: | http://www.achacachi.gob.bo/index.php |
Achacachi Municipality is one of six municipalities of the Omasuyos Province in the La Paz Department in Bolivia. Its seat is Achacachi.
The municipality is situated in the northern Altiplano of the Bolivian Andes region on the eastern shore of Lake Titicaca bordered to the north by the Larecaja Province, to the east by the Los Andes Province, to the south-east by the Huarina Municipality, to the west by the Santiago de Huata Municipality, to the south by the Huatajata Municipality and Chúa Cocani Municipality (these four municipalities were cantons of the Achacachi Municipality until 2005, 2009, and 2010, respectively),[1] to the south-west by Lake Wiñaymarka and the northern part of Lake Titicaca, and to the north-west by the Ancoraimes Municipality.
The people are predominantly indigenous citizens of Aymara descent (95.04%).