Wetan Island (or Wetang Island) is an island, part of the Babar Islands, in the Moluccas, Indonesia. Its people speak the Wetan language. A species of moth (Theretra wetanensis) was discovered on the island and named for it.

7°53′50″S 129°32′27″E/7.8971105°S 129.5407559°E/ -7.8971105; 129.5407559