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is a town in New Haven County, Connecticut, United States. The population was 6,451 at the 2000 census.
According to the United States Census Bureau, the town has a total area of 18.5 square miles (47.8 km²), of which, 17.8 square miles (46.0 km²) of it is land and 0.7 square miles (1.8 km²) of it (3.79%) is water.
Towns that border Middlebury are Southbury, Woodbury, Watertown, Waterbury, Naugatuck and Oxford.