Middlebury is a town in New Haven County, Connecticut, United States. The population was 7,574 at the 2020 census. The town is part of the Naugatuck Valley Planning Region.

New Haven County is a county in the south central part of the U.S. state of Connecticut. As of the 2020 census, the population was 864,835, making it the third-most populous county in Connecticut. Two of the state's top 5 largest cities, New Haven (3rd) and Waterbury (5th), are part of New Haven County.