Chester is an unincorporated community and census-designated place (CDP) in Lake County, South Dakota, United States.

[5] Chester is in the southeast corner of Lake County, 1 mile (1.6 km) south of Brant Lake and 15 miles (24 km) southeast of Madison, the county seat.

According to the U.S. Census Bureau, the Chester CDP has an area of 0.8 square miles (2.1 km2), all land.

[6] Skunk Creek, the outlet of Brant Lake, forms the western edge of the community and flows south to the Big Sioux River at Sioux Falls.

Near Chester is Buffalo Slough, a National Natural Landmark.