Kelefesia (also: Falafagea, Fallafajea, Kelifijia) is an island in the Haʻapai Archipelago, that belongs to the Kingdom of Tonga.

[1] Among neighboring islands are Nukutula, Nomuka, Tonumea, Fonoifua, Telekitonga, Fetokopunga, Nukufaiau.

Together with Hunga Tonga, it is also the southernmost island of the Haʻapai group at the transition to Tongatapu.

[2] The island has about the shape of a hatchet leaf and is surrounded by diverse coral reefs.

Like the other islands of the Ha'apai group, Kelefesia is occasionally hit by cyclones.