Tern Island, Coral island in French Frigate Shoals, Hawaii, United States.

Tern Island is a small coral cay located in the French Frigate Shoals, stretching approximately one kilometer in length with a width of around 150 meters. The terrain is relatively flat, and a decommissioned airstrip runs along its central portion.

Tern Island was first recorded by French explorer Lapérouse on 6 November 1786 as a small carbonate sand shoal. In August 1942, after the Battle of Midway, the 5th Seabee Battalion and Hawaiian Dredging Company enlarged it from 11 to 34 acres with coral dredging to build a 3,100 ft airstrip and a 5,000 ft steel-pylon seawall. The naval air station was decommissioned on 9 June 1946 after a tsunami inundated the island. A Coast Guard LORAN station operated from 1952 to 1979, followed by a Fish and Wildlife Service field station until 2012.

The name Tern Island refers to the seabirds that nest there, including sooty terns, white terns, brown and black noddies, and great frigatebirds. Seasonal field teams, typically in summer, occupy the island for conservation work, while the Google Street View imagery from 2013 lets people walk the airstrip online.

The island is reached only by sea or by the unattended French Frigate Shoals Airport, which has been unattended since 2010 and is acceptable only for emergency landings. Seasonal field teams occupy it, typically in summer, and the island is still visited periodically. The Google Street View imagery from 2013 follows much of the airstrip and part of the shore.

The island hosts numerous seabird species along with green sea turtles and Hawaiian monk seals that make their home here year-round. This concentration of marine wildlife in one location makes the site remarkable for conservation efforts.