Hagemeister Island is an island in the U.S. state of Alaska, located on the north shore of Bristol Bay at the entrance to Togiak Bay.
The island is 16 miles (26 km) long, has a land area of 115.9 square miles (300 km2), and its highest point is 604 feet (184 m). It has no permanent population at the 2000 census.
It is named for Russian Captain Leonty Andrianovich Gagemeister (IRN), who commanded three voyages to Russian America and around the world. On the Neva in 1806-07, on the Kutuzov in 1816-19, and in 1828-30 on the Krothoy. The name was published as "Ostrov Gagemeister" by Lt. Sarichev (1826, map 3).
The island is part of the Bering Sea unit of the Alaska Maritime National Wildlife Refuge.