Addo is a town in Sarah Baartman District Municipality in the Eastern Cape province of South Africa.
Region east of the Sundays River, some 72 km northeast of Port Elizabeth. In 1931 about 680 hectares were enclosed to form the Addo Elephant National Park. The name is also borne by a railway station, post office and bridge. Of Khoekhoen origin, the name probably means 'euphorbia ravine'.