| Official Name: | Achacha |
| Settlement Type: | Commune and town |
| Pushpin Map: | Algeria |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: |  Algeria |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mostaganem Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Achacha District |
| Unit Pref: | Imperial |
| Population As Of: | 1998 |
| Population Total: | 31360 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Coordinates: | 36.2461°N 0.635°W |
Achacha is a town and commune in Mostaganem Province, northwestern Algeria. It is the capital of Achacha District. According to the 1998 census it has a population of 31,360. The town is one of four other known towns within Achacha District, Khadra, Nekmaria and Ouled Boughalem.[1]