Sparta is a town in Monroe County, Wisconsin, United States.

According to the United States Census Bureau, the town has a total area of 127.6 km2 (49.3 sq mi), all land.

The racial makeup of the town was 98.80% White, 0.04% Black or African American, 0.18% Native American, 0.44% Asian, 0.04% Pacific Islander, 0.07% from other races, and 0.44% from two or more races.

There were 925 households, out of which 36.5% had children under the age of 18 living with them, 72.0% were married couples living together, 5.3% had a female householder with no husband present, and 19.4% were non-families.

14.3% of all households were made up of individuals, and 5.8% had someone living alone who was 65 years of age or older.