Lisbon is a town in New London County, Connecticut, United States, 7.3 miles (11.7 km) by road northeast of Norwich. The town is part of the Southeastern Connecticut Planning Region. The population was 4,195 at the 2020 census. The town center is also known as the village of Newent. The town school is Lisbon Central School. Its only postal code, 06351, is Jewett City, Connecticut, which is a village of the town of Griswold, Connecticut and encompasses all of Lisbon and Griswold.

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.