Akamaru is the third largest island in the Gambier Islands of French Polynesia. It is a small, rocky island with an area of approximately 2.6 km2 (1.0 sq mi). The island is located approximately 7 km (4.3 mi) southeast of Mangareva, at 23°10′52″S 134°54′56″W / 23.18111°S 134.91556°W / -23.18111; -134.91556. Its highest point rises to an elevation of 247 m (810 ft).
The first European to arrive was the navigator James Wilson in 1797. In 1834, the French missionary Honoré Laval celebrated the first Mass on the island. The church of Notre-Dame de la Paix was built between 1835 and 1862. People from Mangareva sometimes visit to maintain the church and pick oranges in season. Three families comprising 11 persons live on the island, next to the church.
The much smaller island of Mekiro is located just off (about 100 m) Akamaru's northwestern shore.