Muhu is an island in the West Estonian archipelago in the Baltic Sea. With an area of 198 km² (76 sq mi), it is Estonia's third largest island after Saaremaa and Hiiumaa. Together with the smaller islands of Kesselaid, Viirelaid, Võilaid, and Suurlaid, it forms the parish of Muhu, a rural municipality in the Saare county. The municipality had a population of 2,118 as of October 1, 2025.