The Rennell fantail (Rhipidura rennelliana) is a species of bird in the family Rhipiduridae. It is endemic to Rennell Island (Solomon Islands).
Its natural habitat is subtropical or tropical moist lowland forests.
The plumage is mostly mouse-brown, while the color of throat is somewhat paler. There is a reddish stripe on the wing. The long tail, which the bird often spreads, is with a pale fringe. Avoids open spaces, preferring forest (mostly virgin ones). This is the only fantail on Rennell Island. The usual sound is piercing and squeaky.
Rennell fantail (R. rennelliana) forms a superspecies with: