Indian Island is an unincorporated community in Jefferson County, Washington, United States.

The entire island has a land area of 11.28 km2 (4.3553 sq mi) and a population of 44 persons as of the 2000 census.

Navy combat ships and Military Sealift Command vessels frequent Indian Island's dock receiving and discharging munitions in support of U.S. military operations worldwide.

The Navy also services refitted Ohio class missile submarines (formerly SSBN, now SSGN) at Indian Island.

Environmental and peace activists have raised questions about Navy activities at Indian Island.