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.

This article about a location in Mostaganem Province is a stub.