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Sucia Island () is located 2.5 miles (4.0 km) north of Orcas Island, in the San Juan Islands, San Juan County, Washington, United States. It is the largest of an archipelago of ten islands including Sucia Island, Little Sucia, Ewing, Justice, Herndon, the Cluster Islands islets, and several smaller, unnamed islands. The group of islands is about 2.5 miles (4.0 km) in length and just under half a mile wide. Sucia island is roughly shaped like a hand. The total land area of all the islands is 2.74 km (1.06 sq mi; 680 acres), while the main island, Sucia Island, alone measures 2.259 km (0.872 sq mi; 558 acres). According to the 2000 census, there was a permanent population of four people, all residing on Sucia Island. Sucia Island Marine State Park is a part of Washington State Parks.