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is an unincorporated community in Montmorency County, Michigan, United States. It is a census-designated place (CDP) used for statistical purposes. The population was 990 at the 2000 census. The Lewiston post office first opened on April 25, 1892.
According to the United States Census Bureau, the CDP has a total area of 8.6 square miles (22.2 km²), of which, 5.3 square miles (13.7 km²) of it is land and 3.3 square miles (8.5 km²) of it (38.39%) is water.