Warren is a town in Litchfield County, Connecticut, United States. The population was 1,351 at the 2020 census. The town is part of the Northwest Hills Planning Region. The town was named for Revolutionary War General Joseph Warren.

Litchfield County is in northwestern Connecticut, United States. As of the 2020 census, the population was 185,186. The county was named after Lichfield, in England. Litchfield County has the lowest population density of any county in Connecticut and is the state's largest county by area.