Ata is a small, rocky island in the far south of the Tonga archipelago, situated on . It is also known as Pylstaart island. It should not be confused with Atā, which is an uninhabited, low coral island in the string of small atolls along the Piha passage along the northside of Tongatapu, and for sure not with the populated Atatā island, also north of Tongatapu.