Ga West Municipal Assembly is one of the twenty-nine districts in Greater Accra Region, Ghana.

Later, the western part of the district was split off to create the first Ga South Municipal Assembly on 29 February 2008 (which was later split into two new districts: Weija Gbawe Municipal Assembly (capital: Weija) and the present Ga South Municipal Assembly (capital: Ngleshie Amanfro) on 15 March 2018), with Weija as its capital town; while Ga West was later elevated to municipal district assembly status during that same year to become Ga West Municipal District.

However on 15 March 2018, the eastern part of the district has split off to create Ga North Municipal Assembly, thus the remaining part has been retained as Ga West Municipal Assembly.

The municipality is located in the western part of Greater Accra Region and has Amasaman as its capital town.

The Ga West Municipal Area is located within the Densu River Basin, making it a very important riparian zone.