Gahi is a village in Wallis and Futuna, a French overseas collectivity in the South Pacific. It is situated in Mua District on the southeast coast of Wallis Island, positioned on Gahi Bay.
According to the 2018 census, Gahi had a population of 249 people. As a small coastal settlement, it forms part of the administrative and residential structure of Wallis Island, the larger of the two main island groups in the territory.