Tobi is an island in the Palauan state of Hatohobei. Tobi Island is 1.6 km long and 0.8 km wide, and has an area of about 0.85 square kilometres (0.33 sq mi). With a population of about 30, it holds all of the state's people, with the exception of a weather base on Helen Island. Most of the inhabitants live on the island's west side and speak Tobian.

Tobi, or Hatohobei (Tobian), is the southernmost of Palau's sixteen states, consisting of Tobi Island and Helen Reef. The total land area is about 0.88 km². The population was 25 in 2015. Tobian, English, and Sonsorolese are the official languages of Hatohobei State.