Kosciusko Island

Kosciusko Island is an island in the Alexander Archipelago of southeastern Alaska, United States. It lies near the northwest corner of Prince of Wales Island, just across the El Capitan Passage from the larger island.

The island is home to Mount Francis, Holbrook Mountain, and Tokeen Peak. Kosciusko Island has a land area of 171.585 sqmi, making it the 38th largest island in the United States. It had a population of 52 persons as of the 2000 census, all in Edna Bay, its only populated town.

Kosciusko Island was named in 1879 by William H. Dall of the United States Coast and Geodetic Survey for Tadeusz Kościuszko.

The location of the long deserted village named Shakan is on the northwest coast of Kosciusko Island, not on nearby Shakan Island.