ûUiha is an island in Lifuka district, in the Haûapai islands of Tonga. It had a population of 638 in 2006 and an area of . The island has two villages, ûUiha and Felemea.
During the summer of 1863 islanders ambushed the slave ship margarita during a blackbirding expedition.
In September 2022 the island's electricity system was transition from a diesel generator to a solar-battery system with diesel backup.