Daikoku Island (大黒島, Daikoku-jima) is an uninhabited island in Akkeshi, Hokkaidō, Japan. Together with the smaller island of Kojima (小島) to the north, it forms a natural breakwater at the entrance to (厚岸湾). At the southwest tip of the island at an elevation of approximately 105 metres is Akkeshi Lighthouse (厚岸灯台), which began operations on 25 November 1890. Of the island's 107 hectares, 64 are owned by the state, 42 by the municipality, and one is in private hands.