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is a town located in western New Haven County, Connecticut, United States north of Oxford and Newtown and east of Brookfield. The population was 18,567 at the 2000 census.
Southbury comprises rural country areas, suburban neighborhoods, and historic districts. It is located a short distance from major business and commercial centers and is within of New York City and of Boston.
Southbury is the only town in the country with the name 'Southbury', which may be why the town seal reads "Unica Unaque," meaning "The One and Only."
According to the United States Census Bureau, the town has a total area of 40.0 square miles (103.5 km²), of which, 39.1 square miles (101.2 km²) of it is land and 0.9 square miles (2.4 km²) of it (2.28%) is water.
Towns that border Southbury are Middlebury, Woodbury, Roxbury, Bridgewater, Brookfield, Oxford and Newtown.
South Britain and Southford are included in the incorporated township of Southbury.