Inahamne is a lake in Lääne County Lääne-Nigula Parish on the island of Osmussaar.

The lake lies in the southern part of Osmussaar, 100 metres (330 ft) from Storhamne bay.

The shoreline of the lake is 2,656 metres (8,714 ft) long. Its area is 13.9 hectares (0.139 km) and its drainage basin's size is 0.4 square kilometres (0.15 sq mi).