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is a town in Waldo County, Maine, United States. The population was 642 at the 2000 census.
The most prominent landmark in Prospect is Fort Knox, a very large nineteenth century granite fort built to protect the Penobscot River and the lumber port of Bangor, Maine. It is now a major tourist attraction.
According to the United States Census Bureau, the town has a total area of 20.2 square miles (52.4 km²), of which, 18.1 square miles (46.9 km²) of it is land and 2.2 square miles (5.6 km²) of it (10.62%) is water.