Suffield is a town in Hartford County, Connecticut, United States. The town is part of the Capitol Planning Region, and located in the Connecticut River Valley. As of the 2020 census, the population was 15,752. The town center is a census-designated place listed as Suffield Depot.

Hartford County is a county located in the north central part of the U.S. state of Connecticut. According to the 2020 census, the population was 899,498, making it the second-most populous county in Connecticut. Hartford County contains the city of Hartford, the state capital of Connecticut and the county's most populous city, with 121,054 residents at the 2020 census. Hartford County is included in the Hartford-East Hartford-Middletown metropolitan statistical area.