Taʻū is the largest inhabited island in the Manuʻa Islands and the easternmost volcanic island of the Samoan Islands. Taʻū is part of American Samoa. In the early 19th century, the island was sometimes called Opoun.

The National Park of American Samoa is a national park in the United States territory of American Samoa, distributed across four islands: Tutuila, Ofu, Olosega, and Ta‘ū. The park preserves and protects coral reefs, tropical rainforests, fruit bats, and the Samoan culture. Popular activities include hiking and snorkeling. Of the park's 8,257 acres (3,341 ha), 2,500 acres (1,000 ha) is coral reefs and ocean. The park is the only American National Park Service system unit south of the equator.