The Island of Hawai i (called the Big Island or Hawai i Island) in the U.S. state of Hawai i is a volcanic island in the Pacific Ocean. With an area of 4,028 square miles (10,432 km²), it is the largest island in the United States and larger than all of the other Hawaiian Islands combined.

Hawai i is said to have been named for Hawai iloa, the legendary Polynesian navigator who first discovered it. However, other accounts attribute the name to the legendary land or realm of Hawaiki, a place from which the Polynesians originated (see also Manua), the place where they go in the afterlife, the realm of the gods.

The Island of Hawai i is administered under the County of Hawai i. The county seat is Hilo. It is estimated that as of the year 2003, the island had a resident population of 158,400 persons.