Little Diomede Island (native name Ignaluk; formerly known as Krusenstern Island which can also refer to other places however) is an island of Alaska, United States. It is the smaller of the two Diomede Islands located in the middle of the Bering Strait between the Alaska mainland and Siberia. Its neighboring island Big Diomede is less than 2.4 miles (4 km) to the west, but is part of Russia and west of the International Date Line.

The entirety of the island is in the city of Diomede, also known by its native name Inalik. The island is not part of any organized borough, so some services are provided directly by the state. For census purposes, it is included in the Nome Census Area.

Little Diomede received international exposure when it was featured in the travel series Full Circle with Michael Palin, in which actor Michael Palin set off on a year-round excursion to the countries encircling the Pacific Ocean; Little Diomede was the launch point for this trip.