Harwinton is a town in Litchfield County, Connecticut, United States. The population was 5,283 at the 2000 census. The high school is Lewis S. Mills. The name of the town is partly a blend of Hartford and Windsor, plus the suffix "."

According to the United States Census Bureau, the town has a total area of 31.1 square miles (81 km²), of which, 30.8 square miles (80 km²) of it is land and 0.3 square miles (0.78 km²) of it (1.13%) is water. The southeastern portion of the town contains the Roraback Wildlife Area and several reservoirs.

As of the census of 2000, there were 5,283 people, 1,958 households, and 1,546 families residing in the town. The population density was 171.8 people per square mile (66.3/km²). There were 2,022 housing units at an average density of 65.8 per square mile (25.4/km²). The racial makeup of the town was 98.69% White, 0.08% African American, 0.06% Native American, 0.51% Asian, 0.06% Pacific Islander, 0.13% from other races, and 0.47% from two or more races. Hispanic or Latino of any race were 0.89% of the population.

There were 1,958 households out of which 33.7% had children under the age of 18 living with them, 70.6% were married couples living together, 5.2% had a female householder with no husband present, and 21.0% were non-families. 17.2% of all households were made up of individuals and 8.4% had someone living alone who was 65 years of age or older. The average household size was 2.70 and the average family size was 3.05.

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