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.^[1] The island is administered by Hiiu County, and along with a number of other islands, makes up the Hiiumaa Islets Landscape Reserve (Estonian: Hiiumaa laidude maastikukaitseala).^[1]