Mohotani (sometimes spelt Moho Tani; also called Molopu or Motane) is an uninhabited island southeast of Hiva Oa and east of Tahuata in the southern Marquesas Islands. It has an area of 15 km². Much of the island's sparse vegetation has been destroyed by feralgoats and sheep, to the extent that following its rare rains, the sea around it is stained red from runoff. Early reports describes the island as fertile, with forest and fields. When Thor Heyerdahl visited the island in 1938, there were only a few goats and remains of deserted huts and villages.
It is reported that at one time the island was inhabited by a clan called the “Moi a Tiu”, but that population has long since been wiped out by disease and war, the few survivors having departed for Hiva ʻOa. In pre-European times, the island was considered part of the territory of the province of Pepane.