Griswold is a town in New London County, Connecticut, United States. The population was 11,951 at the 2010 census. Griswold contains one borough, Jewett City, and also contains the villages of Doaneville, Rixtown, Glasgo, Hopeville, and Pachaug.

Long a fishing ground for the Mohegan people, the waterways attracted settlers who established ironworks, saw and corn mills, and other businesses.

The town of Griswold was originally the "northern" part of the town of Preston. As the local population grew, at the request of residents who had been travelling to Preston for church functions, the North Society was established in 1716.

In the late 1700s, Eliezer Jewett opened several mills and an irrigation plant. His success led the area to be called Jewett City. The town of Griswold incorporated in 1815, naming itself after Governor Roger Griswold. In 1895, Jewett City incorporated as a borough of the town. Griswold contains Hopeville Pond State Park, former site of a woolen mill.

The Pachaug and Quinebaug rivers flow through the town of Griswold, which is located at the northeastern edge of New London County. According to the United States Census Bureau, the town has a total area of 37.1 square miles (96.0 km²), of which 34.7 square miles (89.9 km²) is land and 2.4 square miles (6.1 km²), or 6.37%, is water.

As of the census of 2010, there were 11,951 people, 4,646 households, and 3,225 families residing in the town. The population density was 344.4 people per square mile (132.9/km²). There were 5,118 housing units at an average density of 147.5 per square mile (56.9/km²). The racial makeup of the town was 91.6% White, 1.8% African American, 0.9% Native American, 2.2% Asian, 0.03% Pacific Islander, 0.6% some other race, and 2.8% from two or more races. Hispanic or Latino of any race were 3.3% of the population.

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