Midai Island is an island in the Natuna Regency, Riau Islands, Indonesia. The island area of 26.19 km<sup>2</sup> is split between the Midai District and the Suak Midai District, with a combined population of 5,289 in mid 2023. The island is only accessible by boat and has a port on the west side of the island, near Sabang Barat.