Martin is a city in Bennett County, South Dakota, United States. The population was 1,071 at the 2010 census. It is the county seat of Bennett County.
Martin is located at 43°10′30″N 101°44′3″W / 43.175°N 101.73417°W / 43.175; -101.73417 (43.174923, -101.734287).
According to the United States Census Bureau, the city has a total area of 0.9 square miles (2.4 km²), all of it land.