Fa'a'aha is an associated commune located in the island commune of Taha'a, in French Polynesia. It is situated in the subdivision of the Leeward Islands, an overseas collectivity of French Polynesia.
The associated commune of Fa'a'aha is made up of part of the island of Taha'a, and the two motus closest to this region: Mahae'a and Toahotu.