Luigerahu is a small, moraine-based Baltic Sea island that belongs to the country of Estonia.
Luigerahu covers approximately 0.2 hectares and lies half a kilometer off the western coast of the island of Ahelaid. The island is adiministered by Hiiu County, and along with a number of other islands, makes up the Hiiumaa Islets Landscape Reserve (Estonian: Hiiumaa laidude maastikukaitseala).
Coordinates: 58°44′25″N 23°08′45″E / 58.7402°N 23.1457°E