Lebanon is a town in New London County, Connecticut. The town is part of the Southeastern Connecticut Planning Region. The population was 7,142 at the 2020 census. The town lies just to the northwest of Norwich, directly south of Willimantic, 20 miles (32 km) north of New London, and 20 miles (32 km) east of Hartford. It is best known for its role in the American Revolution when it was a major base of American operations, and for its historic town green, which is one of the largest in the nation and the only one still used partially for agriculture.

New London County is in the southeastern corner of Connecticut and comprises the Norwich-New London, Connecticut Metropolitan Statistical Area, which is also included in the Hartford-East Hartford, Connecticut Combined Statistical Area. There is no county government and no county seat, as is the case with all eight of Connecticut's counties; towns are responsible for all local government activities, including fire and rescue, snow removal, and schools.