Mount Tukosmera is the tallest mountain on Tanna, Vanuatu.

It is located in the southern part of the island.

It was a volcano in the Pleistocene, but is no longer active, unlike Mount Yasur.

The mountain has special religious significance for the adherents of the John Frum movement, as a place from which gods come.

[citation needed] A 6,000-hectare (15,000-acre) tract of the upper slopes of the mountain has been recognised as an Important Bird Area (IBA) by BirdLife International because it contains a breeding site for a population of collared petrels.