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is a town in Litchfield County, Connecticut, United States. The population was 21,661 at the 2000 census. The zip code for Watertown is 06795. It is a suburb of Waterbury. It borders the towns of Woodbury, Bethlehem, and Thomaston.
It is in the Eastern Standard time zone. Elevation is 620 feet.
According to the United States Census Bureau, the town has a total area of 29.6 square miles (76.6 km²), of which, 29.1 square miles (75.5 km²) of it is land and 0.4 square miles (1.1 km²) of it (1.45%) is water. Watertown also includes the section known as Oakville, which is often mistaken for a separate town. Although Oakville has its own post office and ZIP code, it does not have a charter or town government of its own.